Another year of extreme weather brought the Philippines a super typhoon and the United States the widest tornado ever observed, deadly wildfires, severe drought and killer floods. President Obama released his plan to battle climate change and its impact on people and wildlife, but the warming planet passed another troubling milestone as heat-trapping greenhouse gases continued to accumulate. Here is a look back at some of the most significant events to affect the environment in 2013. — Lenny Bernstein and Darryl Fears
Moose were eaten alive by ticks, two subspecies of butterflies in Florida disappeared, frog and amphibian populations plummeted, and a new study showed that crabs will super-size in the coming years by ingesting increased carbon in oceans. Warmer winters in New Hampshire aren’t killing ticks, so up to 150,000 hitch a ride and get dinner from a single moose. Some frog populations face a 50 percent drop, probably because of climate change and pesticide use. As humans rip out meadows for homes and spray yards with pesticides, butterflies are dying, including the rockland grass and Zestos skippers in South Florida.