After declining for nearly a decade, the number of hungry people in the world is growing again. Climate change, which is disrupting weather patterns that farmers rely on, is a major cause.
Infrastructure systems – roads, water treatment systems, power grid – can't be built the same ways as in the past. What's a better roadmap for the future?
In the 'World Climate' simulation, people play delegates to UN climate negotiations and work to strike an agreement that meets global climate goals. Playing it has made thousands want to take action.
Convincing people to see and appreciate the threats posed by climate change is one of the great challenges of our day. Insurers may be able to succeed where scientists and educators have failed.
A big spill in Michigan's Straits of Mackinac could have devastating consequences. But does replacing the pipeline running beneath it make sense in a warming world?
The latest UN climate report makes it clear that the task of limiting climate change is urgent and huge. We must start to transform our economy today, but it will bring rewards as well as challenges.
Climate scientists have set out how we could limit global warming, but their scenarios are not at all realistic.
The kind of climate action outlined by the ubiquitous climate checklists won't be enough.
The UN's panel on climate change said that technologies to remove CO2 will be necessary to limit global temperature rise to only 1.5 degrees Celsius. But these techniques are largely unproven.
Limiting human-induced warming will be tough, given where we start from.
Limiting global warming to 1.5C is a tough challenge but still within reach, according to a landmark report from the Intergovernmental Panel on Climate Change commissioned after the 2015 Paris summit.
The world needs to be carbon-neutral by mid-century to give ourselves a chance of holding global warming to 1.5C. With around 1% of the global carbon budget, Australia needs to rapidly do its share.
Here are the essential facts from the UN's special report on climate change.
The first IPCC conference on cities has highlighted the challenges of reconciling science, urban practices and politics. But it was an important recognition of cities' leading role in climate action.
Climate change imperils food supply in many parts of the world, including South Africa, which has shown major gains in treating HIV/AIDS. Climate change could mean even less food -- and more disease.
Lee: 'Business will be far from usual in a world of four, five or six degrees of warming.'
Marine scientists have been accused of being biased towards 'doom and gloom'. But it's not bias if the outlook for coral reefs really is gloomy.
How will the world actually deliver on the Paris climate ambition to hold global warming to no more than 1.5℃? It's a tough scientific and technical challenge.
The scientific case rests on six key observations.
The greenhouse gases that cause climate change will take centre stage at the upcoming Paris climate talks. What are they and what are their effects?