For human populations and ecosystems to thrive, that water must be clean, it must stay clean and, most importantly, it must be accessible to all.

UNESCO: World Water Day 22 March 2010: Clean Water for a Healthy World

Whatever the dispute about the rates and amounts of sea level rise, it is evident that coastal populations and ecosystems will need to adapt to these changes.

UNESCO: Biodiversity Initiative

Hydropower dams are unpopular with conservationists because they disrupt river ecosystems, kill spawning fish populations, and release large amounts of methane from decaying vegetation along riverbeds.

FORBES: Renewable Energy Delusions: Getting A Real Grip On Alternatives