Scores of environmental groups issued a joint appeal Monday for the European Union to drop carbon removal methods from its climate plans, arguing that some of them rely on untested technology while others may not absorb as many greenhouse gas emissions as claimed.

The EU's executive Commission has proposed creating a system for certifying so-called offsets — carbon absorbed through nature or with technological means — which could then be bought by polluters to reduce their emissions balance.

But some 170 groups including Friends of the Earth, Corporate Accountability and the Center for International Environmental Law argue that plans to use fields, forests or machines for future large-scale removal of carbon from the atmosphere are a "greenwashing fantasy."

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They have instead called for the Commission to commit to real, or gross, cuts in emissions, instead of net cuts that many countries and companies are currently touting in their climate plans. The 27-nation EU aims to achieve ‘net zero’ emissions by 2050.

Flags that symbolize the European Union are seen waving on a pole at the Belgian capital in front of the Le Berlaymont building in Brussels. Environmental groups are calling for the E.U. to remove carbon removal methods from its climate plans. ( Nicolas Economou/NurPhoto via Getty Images)

Scientists say emissions of planet-heating gases caused by human activity, such as burning fossil fuels, need to be halved by 2030 and end completely by mid-century to keep alive the Paris climate accord's goal of limiting global warming to 1.5 degrees Celsius.

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The European Commission didn't immediately respond to a request for comment.

Environmental groups issue joint appeal for EU to remove carbon removal methods from climate plans

Environmental groups instead are calling for the commission to commit to real cuts in emission