Cars are an expensive — but often necessary — part of life. And electric cars? Forget it.

That tends to be a problem with a lot of sustainable products: the overhead is just too high, even if it does ultimately pay for itself in the long run.

Unfortunately, this still leaves proponents of clean living in a a pickle. The only reason that fossil fuels seem more affordable is because of the infrastructure that's already in place.

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Natural Resources Defense Council

You remember Koko the gorilla, right?

Koko was born in the '70s at the San Francisco Zoo. Francine (Penny) Patterson, then a Ph.D. candidate at Stanford, started studying young Koko's linguistics capabilities and eventually taught her a rudimentary version of sign language.

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15 times politicians did the right thing in 2015.

You may not always agree with these politicians, but let's give credit where credit is due.

2015 has been a big year in a lot of ways.

The Supreme Court ruled on marriage equality and upheld the Affordable Care Act. The people of Ireland became the first country to grant the right to same-sex marriage by popular vote. There have been lots of good political things happening behind the scenes, but how about a few examples of positive things politicians did throughout the year?

1. World leaders came together and signed on to a historic climate change agreement.

Earlier in December, world leaders met in Paris to address an issue vital to the Earth's survival: climate change. And for once, the politicians in attendance got real about the need and urgency to take immediate action.

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For the first time in history, representatives of 195 nations agreed to dramatically reduce greenhouse gas emissions.

Rejoice! Hooray! The world is saved!

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The Wilderness Society