The Sun will shine. Plants will grow. Then plants will rot, putting methane into the atmosphere UNLESS someone captures the methane. Everyone everywhere can capture methane from rotting plants and thus produce their own energy.
For thousands of years people all around the world have used bio-digesters to produce methane then burned that methane to power their homes and businesses. You can produce your own power independent of government, independent of power companies.
Be careful, like any fuel, bio gas is dangerous. In particular, research fire arresters.
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I simply found them on the internet and give them to you to help you get started on your research.
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May God bless you and your efforts,
https://www.youtube.com/watch?v=mMejL_oU8UM energy from waste
An engine you can build and fuel by yourself