Climate change is causing birds to shrink, U.S. study suggests

Scientists cited a phenomenon called Bergmann's rule, in which individuals within a species tend to be smaller in warmer regions and larger in colder regions, as reason to believe that species may become smaller over time as temperatures rise.

Is the Liberal climate plan achievable?

What did the Liberal party promise when it comes to climate change and which of those promises will it be able to keep? Here's what you need to know.