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Though climate change is normal in Earth's history, global warming has raised average temperatures to their highest in two millennia, resulting in melting ice caps, shorter …
While change has been fundamental to the planet throughout its history, people have altered the environment in myriad ways: resources are being overexploited; natural landscapes …
Earth is the water planet, but only a tiny amount of the planet's water is fresh and usable, and water pollution has become a monumental dilemma as we enter the 21st century. …
No other species in Earth's history has been able to disregard the natural laws that govern population size quite like humans have. And as a result we have experienced an …