Latest Steven Davis Stories
It is difficult to measure accurately each nation's contribution of carbon dioxide to the Earth's atmosphere.
Accurately calculating the amount of carbon dioxide emitted in the process of producing and bringing products to our doorsteps is nearly impossible, but still a worthwhile effort, two Carnegie researchers claim in a commentary published online this week by Proceedings of the National Academy of Sciences.
Geologists have found evidence that some 55 million years ago a river as big as the modern Colorado flowed through Arizona into Utah in the opposite direction from the present-day river.
The Green Revolution of the late 20th century increased crop yields worldwide and helped feed an expanding global population.
A new study by scientists at the Carnegie Institution finds that over a third of carbon dioxide emissions associated with consumption of goods and services in many developed countries are actually emitted outside their borders.
- A transitional zone between two communities containing the characteristic species of each.