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In this article it talks about how a Nuclear Bombs could Save the Earth from Asteroids. It also talks about how how large they are and how they could effect the earth

this site is talking about the world  becoming too hot to sustain life.

If aliens ever sent us a message, scientists hope to pick it up in a remote part of northern California. There, in a clearing nestled amid the volcanoes of the Cascade Range, 42 radio dishes point together at the sky. The dishes, each 20 feet across, form a single, giant scientific instrument called the Allen Telescope Array.

Safeguarding one of the world's most important resources.

Antarctica may seem like the dead continent, but it once bustled with life - a little of which still survives The Friis Hills in Antarctica are dead and dry, nothing but gravel and sand and boulders. The hills sit on a flattop mountain 60 kilometers from the coast.

The average surface temperature of earth has increased more than 1 degree Fahrenheit since 1900 and the rate of warming has been nearly three times the century-long average since 1970. Almost all experts studying the recent climate history of the earth agree now that human activities, mainly the release of heat-trapping gases from smokestacks, tailpipes, and burning forests, are probably the dominant force driving the trend.

Earth Disaters

When volcanoes erupt, they can release ash, chunks of rock and torrents of lava. Now scientists have found that eruptions also can spew massive amounts of a chemical called bromine. This gas helps destroy the ozone layer, a segment of the upper atmosphere that protects life on Earth from the sun's harmful ultraviolet rays.

Flying predators probably gobbled up the biggest of the large flying insects 150 million years ago About 300 million years ago, long before the first dinosaurs appeared, a different type of oversized critter inhabited Earth: giant insects. Scientists suspect bugs grew bigger then because the atmosphere contained more oxygen than it does now.