Summary . President Obama is weighing a decision whether it is in the national interest to approve the Keystone XL pipeline. It would ca...

Global warming is the rise in the average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation. Since the ...
Summary . President Obama is weighing a decision whether it is in the national interest to approve the Keystone XL pipeline. It would ca...
Summary . The world’s use of energy is expanding. Much of this demand is concentrated in developing countries of the world, especially C...