For the first time in the past 40 years, a growth in the global economy did not translate into growing carbon emissions. Instead, in an encouraging sign in the war against climate change, emissions stayed flat in 2014 despite an uptick in the world’s economy, the International Energy Agency said in a special report published ahead of a key climate meeting in Paris later this year.

Renewable energy sources accounted for nearly half of all new power generation capacity in 2014, led by growth in China, the United States, Japan, and Germany, with investment remaining strong at $270 billion and costs continuing to fall, the agency said.

However, not everything is so rosy.