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During the past billion years, the Earth's climate has fluctuated between warm periods—sometimes even completely ice-free—and cold periods, when glaciers scour the continents. In this article, climate scientist Kirk Maasch offers perspective on these historic changes, including the likely causes of the last great ice age—which contrary to common knowledge, we are still in the midst of.
Asteroid mining: Land grab in space
Planetary Resources seeks to mine asteroids to further space exploration and to bring resources back to Earth. Experts say the idea is no longer science fiction.