There's an enormous chunk of ice waiting to fall off the Antarctic ice shelf. It's the size of Prince Edward Island (or Manhattan), 5660 square kilometres. There are unknown dangers but there are definite consequences when a chunk of ice this is size reaches shallow depths of ocean and scrapes its heft along the ocean floor. Penguins and their chicks have difficulty traversing around something this large and entire colonies become unviable. Scientists seem to be uncertain as to long term, less localized consequences but the sheer size adds to the drama.
Then there is the matter of the much smaller honey bee whose appearance is much less dramatic but the importance of this small insect is difficult to overstate.
This article in The Guardian details how despite years of research and warnings we are still setting ourselves up for the catastrophic consequences that would arise from the death of bees.
You can start small and in doing so save yourself a tedious task. Let dandelions take over your lawn. This article in The Guardian makes us aware that in addition to bees, beetles and birds benefit.
The BBC is hosting a series The Wonder of Bees which should be worth watching.