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Which from of Energy is currently causing the largest amount of greenhouse gas emissions globally? 

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China is already the world's second largest producer of greenhouse gases, and its emissions will increase substantially during the coming generation.
Resource efficiency reduces greenhouse gas emissions by 15–20% in 2050, with global emissions falling to 63% below 2015 levels when combined with a 2 °C emissions pathway.
It is likely that, worldwide, less than half of all anthropogenic greenhouse gas emissions are generated within city boundaries.
The results indicate causal relations in the group of countries with the greatest reduction of greenhouse gas emissions, the highest reduction of energy intensity and the highest share of renewable energy consumption in total energy consumption.

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