Bill Gates

It’s extremely difficult and expensive to store electricity on a large scale, but that’s one of the things we’ll need to do if we’re going to rely on intermittent sources to provide a significant percentage of clean electricity in the coming years.

Sustainable Energy—Without the Hot Air, David MacKay

We manufacture an enormous amount of materials, resulting in copious amounts of greenhouse gases, nearly a third of the 51 billion tons per year. We need to get those emissions down to zero, but it’s not an option to simply stop making things.