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UN statement says passenger-rail system has reduced emission of harmful pollution levels in New Delhi by 630,000 tons a year
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Green Belt Movement founder, 71, passed away in Nairobi hospital Sunday after long struggle with cancer
Ugandan government denies claim says British charity report gives inflated numbers
Research contradicts claim that tar balls from worst oil spill in US history have 'substantially' broken down
Experts say Ocean observatory will be transformative
Poachers poisoning water supplies to 'silently' kill animals
Farmscape assists the growing number of Americans who grow fruit and vegetables in their home gardens
Forty percent of all frogs in danger of extinction, according to the Smithsonian Institution
Research also leads to rediscovery of three frog species thought to have been extinct
Appears to be 1.75 million years old
Smithsonian's Tropical Research Institute, world's oldest and largest is a mecca for tropical researchers
Fossils show primitive and modern traits
Green Truck is designed to be green, organic, low cost, mobile, and profitable, challenging common notions of food-vending trucks
Coast Guard report says disaster result of poor risk management, a faulty cement job, and a series of misinformed crew decisions
Medical researchers say many first responders suffering higher-than-normal rates of serious disease, psychological problems
