You would think if hippies really loved the Earth as much as they say they do they would want humans to keep pumping out pollution so we kill ourselves off faster.
After all don't scientists agree that even though humanity might be wiped out the Earth will continue on just fine? Maybe the next species that evolves will be kinder to the Earth from the get go; like star fish, they seem pretty environmentally friendly.
We won't know though unless you give humans the chance to make themselves extinct.