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Additionally, the EIA reported that 90 percent of that energy increase came from wind and solar power. That means that wind and solar power use specifically increased fivefold between 2008 and 2018, Grist reported. The forms of renewable energy accounting for the remaining approximate 10 percent increase include hydroelectric (the greatest source of renewable energy in the country), biomass, and geothermal generation, the EIA noted. Furthermore, Trib Live reported that the increased reliance on wind and solar generation were possible thanks to changes in policy, increased capacity, and declining costs — which will only continue declining as the demand for renewable energy increases.

So, with such a notable shift from fossil fuels to renewables, why is climate change becoming more serious of an issue day by day? For one thing, human activity that causes greenhouse gases is significant. 

Globally, the greatest causes of greenhouse gas emissions (sorted by economic sectors) are electricity and heat production (25 percent) and agriculture of plants and animals (24 percent), according to the IPCC‘s 2014 report. We may be using more renewable energy sources, but energy is still the largest source of greenhouse gas emissions on the planet. Similarly, we may be eating less and less meat (in general, animal-derived foods have the highest environmental footprints, as per Business Insider), but agriculture is still a close second. 



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