Nitrogen makes up 78% of the Earth's atmosphere, but this form of nitrogen (N 2 ) is inert. Allother species of nitrogen are called reactive forms of nitrogen.

Acid rain, more properly termed acid deposition, is the input of acidifying compounds from the atmosphere to the earth's surface. It is comprised primarily of sulfuric

Developing means of farming and agriculture is the reason humans can live in the world today. It is a necessary means of survival, without which there would be famines

Air pollution kills an estimated seven million people worldwide every year. WHO data shows that 9 out of 10 people breathe air containing high levels of pollutants. WHO

Biodiversity is the very basis of human survival and economic well-being, and encompasses all life forms, ecosystems and ecological processes. The current estimates of

Carbon dioxide (chemical formula CO2) is a colorless gas with a density about 60% higher than that of dry air. Carbon dioxide consists of a carbon atom covalently double

Earth's climate is changing. Multiple lines of evidence show changes in our weather, oceans, ecosystems, and more.Natural causes alone cannot explain all of these

Coral reefs aren’t just beautiful underwater fixtures that make the ocean more colorful and vibrant—they’re integral to the survival of many species of marine life.

As the world seeks to slow the pace of climate change, preserve wildlife, and support billions of people, trees inevitably hold a major part of the answer. Yet the mass

The phenomenon known as desertification has received widespread attention recently, as witness the creation of the United Nations Conference on Desertification in Nairobi