That is a flawed comparison, and a poor argument.

Present day worldwide energy usage is a real metric which allows us to calculate the present day 200,000 sq mile figure. Today's temperature doesn't allow calculating anything relevant to global warming.

I assumed you were being hyperbolic and thought some readers might be curious about the hypothetical area of panels required to meet the entire world's energy demand. It's an interesting figure to put things in perspective.

But a claim that widespread solar power will be a leading cause of deforestation is entirely devoid of evidence and fails the basic napkin-math test.

Energy usage will increase over time. Interestingly, so does solar panel efficiency. And most solar panels won't be built in forests. And the Earth will never be 100% powered by solar.

But most compellingly, even if you did have to build solar farms only in forests, and even if you did need to provide 100% of the Earth's demand for energy through those farms, you could do it today with only 40% of the deforestation that's already occurred over the last 25 years.

It's also nice to consider that solar panels built in deserts can even be beneficial to local flora and fauna (although not universally). [1]

[1] https://www.anthropocenemagazine.org/2020/04/can-desert-plan...

Where there is forest there is rain. Where there is rain there are clouds. Where there are clouds there is less sun. Any large scale Oil replacing energy production with solar will be more efficient in places where there is no forest or crop production. Hence the threat for the forest due to solar is not that high. Also where human settle there is no forest afterwards but there are roofs, where they can put PV on. By the way there is a dicusion to make that mandatory.