Bill Gates: If you read one thing about climate change, make it this
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To give an idea of the current spend:
In 2016, the U.S. spent $11 billion on renewable energy subsidies and $3 billion on energy efficiency. [1]
[1] https://www.forbes.com/sites/uhenergy/2018/03/23/renewable-e...
And Germany has put billions and billions of Euros into their aggressive renewable energy push with very little to show for it.
https://m.spiegel.de/international/germany/german-failure-on...
http://folk.uio.no/roberan/t/global_mitigation_curves.shtml
The problem is: we should not despair but act and politicians don't like to ask the voters to sacrifice for a goal of making the future less worse.