The last ice age locked atmospheric carbon dioxide into oceans, which has major implications for how the oceans and carbon dioxide may be linked in the future.
Earth's thermostat can fail spectacularly at times. Around 700 million years ago, huge volcanic eruptions triggered "Snowball Earth".
Set aside the politics. If by some miracle we turned off carbon emissions immediately, how would the climate respond?
Solar radiation management might be able to reduce some of the risks of global warming while countries get their emissions under control.
Pollution has increased carbon in our soils - which is good for climate change. But this carbon may not stay there for long.
While the gases most responsible for global warming - carbon dioxide, methane and nitrous oxide - continue to climb, other industrial greenhouse gases are being brought gradually under control.
Carbon capture and storage gets a bad rap from its associations with 'clean coal'. But the technology could prove vital in cutting emissions from other industries like steel, cement and chemicals.
Why use satellites to study Earth's climate? Researchers leading a new mission explain how images from space will help them analyze which parts of the Americas soak up the most carbon.
Rising carbon dioxide may be a boon for crop yields, but at the expense of nutritional content and quality.
Methane concentrations in the atmosphere are growing at a faster rate than any time in the past 20 years.
Extreme wet years are getting wetter and more common. This means Australia's terrestrial ecosystems will play a larger role in the global carbon cycle.
Phasing out greenhouse gas emissions entirely by mid-century is possible, and promising trends are emerging. But the next five to ten years will be the real test of whether we can make that happen.
Without understanding why the 'fingerprint' has failed to appear our predictions about global warming - as carbon dioxide concentrations increase - are uncertain.
Air pollution from burning firewood and charcoal is the fourth-biggest killer in many countries.
Carbon standards for cars are the cheapest way to cut emissions, and will save drivers money.
The fourth episode of our podcast takes on fuel – from Olympic diets to conflict over oil in the Niger Delta.
Tiny organisms change ocean acidity to benefit themselves.
Victoria has announced a renewable energy target of 40% by 2025.
Despite advances in technology, carbon capture and storage could be unsettled by renewable upstarts.
An Icelandic trial shows carbon dioxide can be pumped underground and stored as rock.