Bumble bees are disappearing due to pesticides and habitat loss. You can make a difference in your own backyard for these vital, native pollinators.
Bee declines driven by combined stress from parasites, pesticides, and lack of flowers
Honeybees, Bumblebees and the Case of the Collapsing Hive
PDF) Plight of the bumblebee
Why we desperately need wild bees
Bees Gone Wild - Scientific American Blog Network
10 Ways to Help Pollinators: Save Bees, Butterflies & Beyond ~ Homestead and Chill
Bee-washing' hurts bees and misleads consumers
Confronting the Plight of Pollinators
Wild Bee Conservation
Humble bees - Bumble bees, Bombus sp. — Bug of the Week
Bondar - Wikipedia