You could warm Mars up, over time, with greenhouse gases.

“The cheapest way to warm Mars may be to use bacteria that convert nitrogen and water into ammonia or that can create methane out…

— Stephen L. Petranek

...warming of the climate system is unequivocal...most of the global average warming over the past 50 years is very likely due to anthropogenic greenhouse…

— Rajendra K. Pachauri

The basic scientific conclusions on climate change are very robust and for good reason. The greenhouse effect is simple science: greenhouse gases trap heat,…

— Nicholas Stern

The world community simply should not support such extreme measures when there are so many other pressing issues at hand. The optimal response to…

— Robert O. Mendelsohn

Global warming results not from the emission of greenhouse gases into the atmosphere, but from an unusually high level of solar radiation and a…

— Khabibullo Abdusamatov

Being vegan or vegetarian isn't just about compassion for animals. Most of the destruction of the planet is the result of all the clear-cutting,…

— William McNamara

Even if we didn't have greenhouse gases, were going to have to move away from fossil fuels, as we're going to run out. They're…

— Ted Turner

That's right-the striking thing about greenhouse gases is the diversity of sources that emit them. A herd of cattle belching can be worse than…

— Thomas Friedman

The message I am trying to get across is exactly this: Protecting the environment does not require us to be against large SUVs or…

— Arnold Schwarzenegger

We have climate change caused by greenhouse gas emissions, mostly from human power and transportation infrastructure. At the same time, we have 2 billion…

— Ramez Naam

'Scientific' computer simulations predict global warming based on increased greenhouse gas emissions over time. However, without water's contribution taken into account they omit the…

— Michael Myers

If Africa is left behind, she is going to continue pumping greenhouse gases into the atmosphere, especially carbon. She's going to continue logging the…

— Wangari Maathai

Connect with people, visibly and loudly showcase initiatives that reduce greenhouse gases emissions, nurture youth leaders, or spread the message by raising awareness through…

— Christiana Figueres

I've been vegan for 15 years, and it turns out it makes a very big impact on the environment to eat fewer animal products,…

— Emily Deschanel

We will pay for this [climate change] one way or another. We will pay to reduce greenhouse-gas emissions today and we'll have to take…

— Anthony Zinni