200 years years applications 2030 years compared future generations green movement ecology botany campuses schools co₂ contributing 30 times denser natural ecosystem technique pioneered environmental rejuvenation revolutionary approach enhance biodiversity allegiance enviro miyawaki forests miyawaki forest miyawaki method miyawaki forest method miyawaki forest projects accelerate forest growth cherish lets grow create thriving ecosystems rejuvenate degraded lands greener cleaner planet thriving ecosystems corporate traditional afforestation methods native species close