The Motley Fool Discussion Boards
Investment Analysis Clubs / Macro Economic Trends and Risks
|Subject: Re: Poll: OT?: Environmental Terrorism||Date: 2/10/2013 11:49 PM|
|Author: putnid||Number: 415556 of 472512|
You left out the fraud of global warming - where our planet is being destroyed in order to save it from a non-existent threat. - AjaxofTelamon
Fraud of global warming!?! Unfortunately, Mother Nature didn't get that memo. Here are several indicators that our planet is, indeed, growing warmer:
There are, of course, many, MANY other indicators, such as shrinking glacial ice mass, population shifts in flora and fauna, earlier and earlier snow cover melts, changes in the jet stream pattern (the polar jet stream keeps shifting northward), melting permafrost, etc., etc., etc.
As for bird kills related to wind turbines as some sorta eco-disaster - please stop. You're simply embarrassing yourself:
Window strikes – estimated to kill 97 to 976 million birds/year – Millions of houses and buildings, with their billions of windows, pose a significant threat to birds. Birds see the natural habitat mirrored in the glass and fly directly into the window, causing injury and, in 50% or more of the cases, death.
Communication towers – estimates of bird kills are impossible to make because of the lack of data, but totals could easily be over 5 million birds/year, and possibly as many as 50 million. Towers have proliferated in recent years, with an estimated 5000 new towers erected per year during the 1990s, mainly for the cell phone and digital TV industries. Any tall structure will kill birds by collision, and lighted towers attract birds at night.
High tension line collisions – may kill up to 174 million birds per year. This figure extrapolates from European studies to the millions of miles of aerial wires in North America. There are very few data in North America.
Electrocutions kill tens of thousands of birds per year. This occurs mainly when large birds such as raptors make contact between a live electrical wire and a ground such as a pole. The relatively small number of birds affected belies the significance of this threat, since species such as Golden Eagle are more susceptible. Large predators like eagles have smaller population sizes and lower reproduction rates than songbirds, so removing a few thousand birds from the population will have a much larger impact than removing the same number of, say, Savannah Sparrows. Studies by HawkWatch International revealed an electrocution rate of just under 1 bird per 100 poles per year, or 547 birds at 74,000 poles in Utah in 2001-2002. About 10% of the birds killed were Golden Eagles, 34% Ravens, and another 25%Buteos (Red-tailed, Swainson’s and Ferruginous Hawks).
Cars may kill 60 million birds per year. Of over 8 million lane miles of roads in the US, 6.3 million, or over ¾, are in rural areas where most birds are presumably killed.
Wind turbines may kill 33,000 birds per year, and, as in the case of electrocutions, these birds tend to be large and scarce (e.g. raptors). The recent surge of interest in wind power has heightened concerns about their effect on birds, and has led to at least the discussion of efforts by the wind power industry to design more benign windmills and to choose locations that are less “birdy”.
Pesticides may kill 72 million birds per year or possibly many more. The sub lethal effects of pesticides may also make the birds more susceptible to predators or unable to reproduce, essentially killing them.
Domestic and Feral Cats – may kill 500 million birds per year or more. More information can be found at The American Bird Conservancy. Predators, of course, account for the vast majority of bird deaths each year, and most of this predation is natural. Domestic cats are not natural predators, but kill many birds. It is worth noting that house cats have been blamed for the extinction of two species of small mammals in the southeastern United States, and feral cats continue to be a huge problem where they have been introduced on many oceanic islands.
|Copyright 1996-2015 trademark and the "Fool" logo is a trademark of The Motley Fool, Inc. Contact Us|