The world’s rivers carry billions of cubic yards of sediment – sand, silt and other material – and transport it to wetlands and coastal areas. Until fairly recently, this was viewed as a negative thing. But that has changed.
We have talked about the monarch butterfly on a number of occasions. The population of these iconic orange and black butterflies in North America has plummeted from 1 billion to 33 million over the past 20 years. People have undertaken a variety of efforts to try to save the species but now a major project to restore the dwindling habitat of the monarch is underway.
The world’s smallest porpoise is in real trouble. According to scientists, there could be as few as 30 vaquitas remaining on the planet. We highlighted the plight facing this species in detail last month.
The worldwide decline in the population of bees and other pollinators has impelled farmers to do what they can to encourage and nurture bees on their land. Protecting bees is important because pollinators are essential for growing many foods including coffee, cacao, almonds and many other fruits and vegetables.
Climate change is posing a major threat to polar bear survival. The polar bear, whose native range lies largely within the Arctic Circle, depends on sea ice for nearly all of its life cycle functions. And rising temperatures are causing that sea ice to disappear.
Globally, 40% of invertebrate pollinator species, such as bees and butterflies, are facing extinction. And since approximately three-quarters of the world’s food crops depend on pollination, the decline of these pollinators could pose a threat to food security around the globe.