Nothing about the greenest and most sustainable solution: reducing consumption. Most Americans could drop their consumption by 75% purely improving their lives, before difficult decisions, many of which would also improve their lives. Several nations, like Thailand, have lowered birth rates purely voluntarily, increasing prosperity and abundance.
Without reducing, new power sources will repeat what led Norman Borlaug said on receiving the Nobel Prize for his part in the Green Revolution:
"The green revolution has won a temporary success in man's war against hunger and deprivation; it has given man a breathing space. If fully implemented, the revolution can provide sufficient food for sustenance during the next three decades. But the frightening power of human reproduction must also be curbed; otherwise the success of the green revolution will be ephemeral only. Most people still fail to comprehend the magnitude and menace of the "Population Monster"...Since man is potentially a rational being, however, I am confident that within the next two decades he will recognize the self-destructive course he steers along the road of irresponsible population growth..."
We haven't made much progress stemming growth. Projections to 2100 still show our population growing, yet our global footprint is greater than one Earth.
Without reducing, new power sources will repeat what led Norman Borlaug said on receiving the Nobel Prize for his part in the Green Revolution:
"The green revolution has won a temporary success in man's war against hunger and deprivation; it has given man a breathing space. If fully implemented, the revolution can provide sufficient food for sustenance during the next three decades. But the frightening power of human reproduction must also be curbed; otherwise the success of the green revolution will be ephemeral only. Most people still fail to comprehend the magnitude and menace of the "Population Monster"...Since man is potentially a rational being, however, I am confident that within the next two decades he will recognize the self-destructive course he steers along the road of irresponsible population growth..."
We haven't made much progress stemming growth. Projections to 2100 still show our population growing, yet our global footprint is greater than one Earth.