Not to mention that there's only so much land on Earth on which we can put solar panels. Sure, we might only need a few percent of the Earth's surface (!) now,

Not to mention that there's only so much land on Earth on which we can put solar panels. Sure, we might only need a few percent of the Earth's surface (!) now, but capitalism requires the credible possibility of boundless growth. Ground-based solar and wind cannot provide that, and I think fusion is capitalism's last great hope.