Here's Elon Musk's Plan to Power the USA on Solar Energy: "you only need about 100 miles by 100 miles of solar panels to power the entire United States"

To your question, which assumes fossil fuel "powers a lot more than homes", it doesn't. If I'm recalling correctly, currently coal supplies ~50% of electricity to homes in the US. The rest is nuclear, gas, and renewables. Petroleum by far produces the smallest amount of electricity in the US. And while fossil fuels are unsustainable and produce a lot of waste, the footprint isn't as much of an environmental disaster compared to others.

But in relation to your question about land use: the amount of corn grown in the US alone could fill up every square inch of its second largest state, Texas (~250,000 square miles). This is all heavily subsidized by taxpayer money, without even going into the subsidies we pay for other industrialized agriculture. These farms make so little money because of the fucked up ag industry that they would literally shut down if it weren't for the subsidies. But the ag corporations make an enormous amount of money. Average Joe Farmer is in debt up to his grandchildren's eyes because of the egregious practices of corporations like Monsanto. Your taxpayer dollars directly fund the profits of these corporations, and many like it, that fuck their workers to death while generating hundreds of billions in profit that go to the 1% who then lobby to fund legislation to rape their workers even harder than they already are. The ROI on the what these corporations pay to Congress against the profits generated would make the richest, smartest trader's head spin right off.

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