Free Writing Prospectus

Filed Pursuant to Rule 433

Registration No. 333-169119

May 24, 2013

GRN iPath® Global Carbon ETN Note Description The iPath® Global Carbon ETN is designed to provide investors with exposure to the Barclays Capital Global Carbon Total Return Index. Index Description The Barclays Capital Global Carbon Total Return Index (the “Index”) is designed to measure the performance of the most liquid carbon-related credit plans. Each carbon-related credit plan included in the Index is represented by the most liquid instrument available in the marketplace. The Index expects to incorporate new carbon-related credit plans as they develop around the world. Note Details Ticker GRN Intraday Indicative Value Ticker GRN.IV CUSIP 06739H164 ISIN US06739H1648 Primary exchange NYSE Arca Yearly Fee1 0.75% Inception date 6/24/2008 Maturity date 6/24/2038 Issuer Barclays Bank PLC Callable ETN No Cumulative Index Return2 Barclays Global Carbon Index Total ReturnTM Source: Barclays (based on daily returns 06/08-12/12 since Note inception date). 2 Index returns are for illustrative purposes only and do not represent actual iPath ETN performance. Index performance returns do not reflect any management fees, transaction costs or expenses. Indexes are unmanaged and one cannot invest directly in an index. Past performance does not guarantee future results. For current Index and iPath ETN performance, go to www.iPathETN.com. Index Details Index name Barclays Global Carbon Index Total ReturnTM Composition Carbon Credits Number of components 2 Bloomberg Index ticker BXIIGCUT Inception date 3/31/2008 Base value and date 100 as of 10/31/2006 Index sponsors Barclays Index Composition Source: Barclays , as of 12/31/2012. Index composition is subject to change. 1 The investor fee is equal to the Yearly Fee times the principal amount of your securities times the index factor, calculated on a daily basis in the following manner: The investor fee on the inception date will equal zero. On each subsequent calendar day until maturity or early redemption, the investor fee will increase by an amount equal to the Yearly Fee times the principal amount of your securities times the index factor on that day (or, if such day is not a trading day, the index factor on the immediately preceding trading day) divided by 365. The index factor on any given day will be equal to the closing value of the index on that day divided by the initial index level. The initial index level is the closing value of the index on the inception date of the securities. Page 1 of 3 iPath® Exchange Traded Notes BARCLAYS Emission Reduction Unit 95.62% Certified Emissions Reductions 4.38% 25% 0% -25% -50% -75% -100% Jan 09 Jan 10 Jan 11 Jan 12

GRN Annualized Performance, Standard Deviation And Correlation History 6-month Return % 1-Year Return % Annualized 3-Year Return % Annualized 5-Year Return % Annualized 10-Year Return % Annualized Standard Deviation % Annualized3 Index Correlations4 Barclays Global Carbon Index Total ReturnTM -33.10 -25.10 -26.12 -25.30 n/a 41.95 1.00 S&P 500® 5.95 16.00 10.87 1.66 7.10 15.30 0.16 MSCI EAFE Index 13.95 17.32 3.56 -3.69 8.21 19.65 0.21 MSCI Emerging Markets IndexSM 13.75 18.22 4.66 -0.92 16.52 21.80 0.26 Barclays U.S. Aggregate Bond Index 1.80 4.21 6.19 5.95 5.18 2.42 0.05 Dow Jones-UBS Commodity Index Total ReturnSM 2.75 -1.06 0.07 -5.17 4.09 17.91 0.31 Source: BlackRock, Barclays, S&P Dow Jones Indices, LLC, MSCI, Dow Jones Opco, UBS, as of 12/31/2012. Index returns are for illustrative purposes only and do not represent actual iPath ETN performance. Index performance returns do not reflect any management fees, transaction costs or expenses. Indexes are unmanaged and one cannot invest directly in an index. Past performance does not guarantee future results. For current Index and iPath ETN performance, go to www.iPathETN.com. 3 Standard deviation is a measure of variability from the expected value. Standard Deviation % Annualized is based on monthly returns for 12/09-12/12, and describes how the annual returns in a given annual period are likely to differ from average annualized returns. Because the Standard Deviation % Annualized is based on historical data, it may not predict variability in annualized performance of the ETNs in the future. Source: BlackRock, Barclays 4 Correlations based on monthly returns for 12/09-12/12. Correlation is the term used to describe the statistical relationship between two or more quantities or variables. Perfectly correlated assets will have a correlation coefficient of one, while the correlation coefficient will be zero when returns on two assets are completely independent. Source: BlackRock, Barclays Selected Risk Considerations An investment in the iPath ETNs described herein (the “ETNs”) involves risks. Selected risks are summarized here, but we urge you to read the more detailed explanation of risks described under “Risk Factors” in the applicable prospectus supplement and pricing supplement. You May Lose Some or All of Your Principal: The ETNs are exposed to any decrease in the level of the underlying index between the inception date and the applicable valuation date. Additionally, if the level of the underlying index is insufficient to offset the negative effect of the investor fee and other applicable costs, you will lose some or all of your investment at maturity or upon redemption, even if the value of such index has increased. Because the ETNs are subject to an investor fee and any other applicable costs, the return on the ETNs will always be lower than the total return on a direct investment in the index components. The ETNs are riskier than ordinary unsecured debt securities and have no principal protection. Credit of Barclays Bank PLC: The ETNs are unsecured debt obligations of the issuer, Barclays Bank PLC, and are not, either directly or indirectly, an obligation of or guaranteed by any third party. Any payment to be made on the ETNs, including any payment at maturity or upon redemption, depends on the ability of Barclays Bank PLC to satisfy its obligations as they come due. As a result, the actual and perceived creditworthiness of Barclays Bank PLC will affect the market value, if any, of the ETNs prior to maturity or redemption. In addition, in the event Barclays Bank PLC were to default on its obligations, you may not receive any amounts owed to you under the terms of the ETNs. Carbon Market Risk: Trading in futures contracts on carbon emissions commodities, including trading in the index components, is speculative and can be extremely volatile. The commodity futures markets are subject to temporary distortions or other disruptions due to various factors, including the lack of liquidity in the markets, the participation of speculators and government regulation and intervention. Market prices of the index components may fluctuate rapidly based on numerous factors including but not limited to changes in supply and demand, domestic and foreign political or government actions and technological developments. These factors could adversely affect the value of the underlying index and, therefore, the value of your ETNs. Cap & trade mechanisms have arisen primarily due to relative international consensus on the correlation between the rise in greenhouse gas emissions and the onset of global warming. Accordingly, changes in regulation and enforcement of cap & trade mechanisms as a result of changes in international consensus can adversely affect market behavior and the value of the ETNs. iP-GRN-I1212 Page 2 of 3

GRN Benefits Risks • May provide portfolio diversification and completion* • No principal protection • Ability to execute tactical views • Credit risk of the issuer • Interest Rate Management • Concentration of index exposure • Hedging Tool • Minimum redemption value directly with issuer • Exchange listed • Market risk • Daily redemption capabilities directly to issuer • Yearly fee and applicable costs • No tracking error to their specified underlying index** * Diversification does not protect against market risk. ** Excluding fees and applicable costs and applies only to the indicative value, not necessarily to the secondary market price. Tracking error refers to the under/over performance differential of an ETN versus its underlying index over a given time period, after accounting for the ETN’s fees and costs. One cannot invest directly in an index. Market and Volatility Risk: The market value of the ETNs may be influenced by many unpredictable factors and may fluctuate between the date you purchase them and the maturity date or redemption date. You may also sustain a significant loss if you sell your ETNs in the secondary market. Factors that may influence the market value of the ETNs include prevailing market prices of the U.S. stock markets, the index components included in the underlying index, and prevailing market prices of options on such index or any other financial instruments related to such index; and supply and demand for the ETNs, including economic, financial, political, regulatory, geographical or judicial events that affect the level of such index or other financial instruments related to such index. A Trading Market for the ETNs May Not Develop: Although the ETNs are listed on NYSE Arca, a trading market for the ETNs may not develop and the liquidity of the ETNs may be limited, as we are not required to maintain any listing of the ETNs. No Interest Payments from the ETNs: You may not receive any interest payments on the ETNs. Restrictions on the Minimum Number of ETNs and Date Restrictions for Redemptions: You must redeem at least 50,000 ETNs of the same series at one time in order to exercise your right to redeem your ETNs on any redemption date. You may only redeem your ETNs on a redemption date if we receive a notice of redemption from you by certain dates and times as set forth in the pricing supplement. Uncertain Tax Treatment: Significant aspects of the tax treatment of the ETNs are uncertain. You should consult your own tax advisor about your own tax situation. Barclays Bank PLC has filed a registration statement (including a prospectus) with the SEC for the offering to which this communication relates. Before you invest, you should read the prospectus and other documents Barclays Bank PLC has filed with the SEC for more complete information about the issuer and this offering. You may get these documents for free by visiting www.iPathETN.com or EDGAR on the SEC website at www.sec.gov. Alternatively, Barclays Bank PLC will arrange for Barclays Capital Inc. to send you the prospectus if you request it by callingtoll-free1-877-764-7284, or you mayrequest a copy fromany otherdealer participating in the offering. BlackRock Investments, LLC, assists in the promotion of the iPath ETNs. The ETNs may be sold throughout the day on the exchange through any brokerage account. Commissions may apply and there are tax consequences in the event of sale, redemption or maturity of ETNs. “Barclays Global Carbon IndexTM” and “Barclays Global Carbon Index Total ReturnTM” are trademarks of Barclays Bank PLC. © 2013 Barclays Bank PLC. All rights reserved. iPath, iPath ETNs and the iPath logo are registered trademarks of Barclays Bank PLC. All other trademarks, servicemarks or registered trademarks are the property, and used with the permission, of their respective owners. iP-0664-0213 iP-GRN-I1212 1-877-764-7284 www.ipathetn.com Not FDIC Insured - No Bank Guarantee - May Lose Value Page 3 of 3