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The countries of Europe, which together represent the world’s third-largest industrial emitter, are set to decide on Thursday whether they can leap to a future largely free of fossil fuels within the next 30 years.

Leaders from all 28 countries of the European Union are in Brussels this week, and analysts following the meeting said a large majority of countries were in favor of a proposal to get to net-zero emissions by 2050. The rules of the bloc, however, require that they reach a unanimous decision.

Several European Union countries have already announced such targets. Britain became the first among the 20 largest industrial economies to announce its net-zero emissions target this week; Sweden has a similar target. Finland and Norway have set the bar highest, resolving to reach the target by 2035.

Net-zero emissions, or climate neutrality, means slightly different things to each country. Norway and Sweden, for instance, aim to neutralize the emissions they generate (Norway is one of the world’s biggest oil producers, after all) by offsetting them by buying credits. Offsets could include things like funding clean-power projects in poor countries. That accounting method can neutralize a country’s carbon footprint but still allow the country to burn fossil fuels.