Energy systems have important and often hamful environmental impacts. Historical and current energy systems producing carbon dioxide are dominated by fossil fuels (coal, oil and gas). They produce as well other greenhouse gases affecting climate change and accelerating exponentially global warming. Up to 2018, Solar, Wind, Hydropower, Nuclear and other minor renewable energy sources barely managed to satisfy 4% of global energy consumption, while production using polluting resources grew close to 50% during the first 18 years of this century. The visible reduction in air pollution due to the paralysis caused by the pandemic, demonstrates the need for a radical transformation of energy sources.
The world’s energy system must be transformed completely
It has been changed before, but never as fast or fully as must happen now. 
For more than 100,000 years humans derived all their energy from what they hunted, gathered and grazed on or grew for themselves. Their own energy for moving things came from what they ate. Energy for light and heat came from burning the rest. In recent millennia they added energy from the flow of water and, later, air to the repertoire.
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fired,” which probably isn’t a question that most people typically get. Fauci answered, “Well, that’s pretty interesting because to [Trump’s] credit, even though we disagree on some things, he listens. He goes his own way. He has his own style. But on substantive issues, he does listen to what I say.”
On the left we have a map that shows (in white) more than half the Earth's surface covered by deserts or whole regions that are experiencing increasing aridity to become deserts. And this image is from 8 years ago. It is much worse now. In dark green we see some small sectors where reforestation efforts were being made, but they are not constant to at least partially recover some forests. The places where forests are being destroyed are highlighted in red.