Meat-free Friday will return next week!
Darryl Fears reported in the Washington Post today about a Senate hearing to "modernize the Endangered Species Act." Unfortunately, many legislators are aiming to gut or repeal the act, rather than make improvements to its implementation. As we saw with this week's postponement of listing of the Rusty Patched Bumblebee, the Act is always under attack. Since most scientists agree that we are currently in the 6th worldwide extinction event (think about what happened with the dinosaurs...), and this one is caused by humans, I thought we might want to take a look at some common misconceptions about endangered species.
Misconception #1 -- Species have always gone extinct, so we don’t need to worry right now. True, species have always gone extinct. Scientists are not concerned about the fact of extinction; it’s the rate of extinction that is a concern. The USFWS,states “Biologists estimate that since the Pilgrims landed at Plymouth Rock in 1620, more than 500 species, subspecies, and varieties of our Nation’s plants and animals have become extinct.” Wow! Current estimates of the current rate of species extinctions are 100 to 1000 times the natural rate which is estimated to be between 1 every year to 100 years. That means that we’re living in a time of mass species extinction, comparable to the extinction of the dinosaurs.
Misconception #2 -- Losing a species won’t affect humans. Species diversity is a critical element in ecosystem health. “Species diversity” is how many different species are found in a habitat and in what proportion they’re found. Some habitats have greater species diversity than others – think rainforest – but all habitats are healthiest when they contain as many different species as they can sustain. Think of a habitat as a fishing net, with each species being piece of rope that connects to other pieces to form the net. If one of the pieces of rope breaks and leaves a small hole, the net can probably be fixed and reused. But what if half the net is torn? It won’t be very useable. The same thing happens in a natural habitat; remove too many species and the habitat ceases to function. How many species can be lost, before the habitat doesn’t function? No one knows – is it an experiment we’re willing to try? The habitats around us provide many services such as medicinal and agricultural resources, clean water and air, and recreation. Healthy habitats benefit humans – they’re a necessity, not a luxury.
Misconception #3 – Once a species is on the endangered species list, it never comes off. Incorrect! Protections under the U.S. Endangered Species Act have led to the recovery of several species or populations of species, including the gray whale, the bald eagle, the brown pelican, and the gray wolf. Many more species have more stable populations due to the act.
Misconception #4 – Pollution is the greatest threat to biodiversity. Actually, habitat loss is the greatest threat to biodiversity. With 7 billion humans on the planet, we take up a lot of space and we’re changing a lot of habitat to new uses.
Misconception #5 – There’s nothing I can do to protect the Earth’s biodiversity. In order to protect biodiversity and endangered species, we all have to make conscious choices about how we use resources. Check out the “low hanging fruit” section as a start. Visit www.myfootprint.org to discover new ways of decreasing your carbon footprint. Get involved in deciding how our country produces energy – research the issue and write to your political representatives. One final thought from famous biologist E.O. Wilson, “The one process now going on that will take millions of years to correct is the loss of genetic and species diversity by the destruction of natural habitats. This is the folly our descendants are least likely to forgive us.” (From Brainy Quote. Web. 12/31/11. <http://www.brainyquote.com/quotes/authors/e/e_o_wilson_2.html#ixzz1i9a6zlii>)