Setting a price for power might seem straightforward, but in reality it's extremely complicated - and residential customers have very little influence in the decision.
Scientists are raising alarms over the planet's warming oceans, which -- coupled with a strong El Niño -- could increase temperatures for land dwellers.
Huge numbers of blackchin tilapia, a fish native to west Africa, are wreaking havoc among Thailand's river ecosystems. Experts - and some chefs - are seeking sustainable solutions ...
This summer, Yosemite national park has been rife with traffic jams and throngs of visitors. Can these popular national treasures withstand a future of strained resources?