Our series is over, but the challenges remain.

Geoengineering could be used to lower global temperatures and capture carbon. The possibilities are tremendous, but so too are the risks.

Traditional assumptions about how we will feed the world’s rapidly growing population are being upended by climate change.

Preparing for the inevitable impacts of climate change through “adaptation.”

We have the technology to produce power from clean, renewable sources. So why don’t we?

Our dependence on coal, oil and natural gas is causing us problems — and it needs to be addressed immediately.

To reduce carbon emissions and meet increasing demand for electricity, we must overhaul our energy system and embrace a major expansion of nuclear power.

It’s a vicious cycle: Our transportation systems emit greenhouse gases that contribute to climate change. And in turn, climate change poses a huge threat to our transportation systems. What can we do?

Congressional action on climate change may be stalled, but the Pentagon is taking a leading role. Rear Adm. David Titley explains why melting glaciers and rising sea levels constitute a dire threat to national security.

Could the widespread use of energy efficient technologies stem the rising tide of climate change? Our experts weigh in.

It’s too late to stop climate change in its tracks, but there are things we can do to reduce and eventually stabilize greenhouse gas emissions.

It’s one thing to try to reduce your own, personal carbon footprint. But what if you’re a giant multinational corporation? Three business leaders outline what their companies are doing.

Climate change is a thorny political issue. Some say without prompt action, the future is looking hot and dangerous. Others don’t even believe the threat is real, let alone urgent.

Science can help us understand the causes and effects of climate change. But what we do about it is an ethical question.

With increasing reports of extreme weather and headlines about 2012 being the warmest year on record, climate change can no longer be ignored.