The caterpillars of Asian gypsy moths can destroy large sections of forest. Sweetgum, apple, popular, oak, willow and linden trees are some of the plants that could be at risk.
Vast oil and gas deposits are believed to be buried under the Arctic, where climate change is melting sea ice and uncovering new commercial opportunities.
"We are looking at cooperation where we can and pushing back aggressively where we must," General David Goldfein said.
Myanmar is holding its historic elections in a matter of weeks.
Frank Biermann argues that the world is ill-prepared to deal with 50 million climate refugees in the next decade.