A series of USA maps illustrates how state temperatures change across the seasons.
Cities with the best climate have the right combination of temperature, sun, rain and wind. Here's what most people agree makes for good city weather.
The chances of getting killed by lightning in Canada are generally less than one in a million. But some people's odds of encountering a deadly strike are much higher than average.
Severe winter storms that leave behind million of dollars in damage have become less common in the United States. But, individual storms have become more massive and destructive.
Most of the world's species remain undiscovered by science. Here are estimates of how many animals and plants have yet to be found.
Red-backed salamanders in eastern North America have responded to warming temperatures by losing their namesake red stripe.
Scientists have compared their own recent observations of when Massachusetts plants start flowering in spring with the records Henry David Thoreau made 150 years ago.
Global warming has broken down the relationship between Arctic climate patterns and fluctuations in the volume of Arctic ice.
Loggers, farmers, poachers and pet dealers have all played a role in the endangered orangutan's decline.
List of extinct animals and plants in Canada and the United States, including species and subspecies that have disappeared since 1960.
Scientists have uncovered the overriding principles that govern why some tree species are confined to a narrow range of latitudes while others thrive across a continent.
Temperatures in boreal forests extending across Canada will soon be warm enough for destructive mountain pine beetles.
Huge gains have been made over the last twenty years in stopping invasive rats and mice from destroying island biodiversity.
People dumping their pet fish into local waterways could introduce yet another exotic species into the Great Lakes watershed.