Why is important to find alternative energy sources?

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In addition to the above answers, which are all valid and important points, we can also look at this from a national security and independence viewpoint.

We import 2/3 of the oil we use, and much of that comes from unstable countries (Nigeria, Iraq), or nations under the rule of...

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In addition to the above answers, which are all valid and important points, we can also look at this from a national security and independence viewpoint.

We import 2/3 of the oil we use, and much of that comes from unstable countries (Nigeria, Iraq), or nations under the rule of a dictator (Saudi Arabia, Kuwait) where human rights violations are common.  We have had forces in and around Iraq for decades now, in order to secure this resource, which is very expensive, costly in terms of life and limb, and has the side effect of encouraging radical Islam.  So one could argue that alternative energy could free us from dependence on these regions, and the foreign policy consequences that come with that dependence.

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It is very important to do this for two reasons.

First, and perhaps most important, we are in danger of ruining the planet's climate through carbon dioxide emissions. If we continue to use fossil fuels, we may increase the temperature of the planet in ways that will harm us and our entire ecosystem.

Second, we cannot keep using fossil fuels forever. They will eventually run out, even as the population of Earth grows.

For both these reasons, we need to find other sources of energy that do not emit carbon dioxide when used.

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