Class Notes (835,893)
Canada (509,478)
Biology (6,813)

lec 19.doc

2 Pages
Unlock Document

Biology 3592A
Milford Green

What Services Do Ecosystems Provide?  Many benefits are irreplaceable or the technology necessary to replace them are very expensive ■ potable fresh water can be provided by desalinating seawater but only at a great cost  rapidly expanding human population has modified Earth's ecosystems to increase their ability to provide some of the goods and services it needs ■ these modifications have contributed to human well-being and economic development  short-term increases in some ecosystem goods have come at the cost of the long-term degradation of others ■ efforts to increase wood and fiber have decreased the ability for some ecosystems to provide clean water, regulate flooding and support biodiversity ■ the spread of agriculture into into marginal lands has increased soil degradation and reduced ability of ecosystems to provide clean water ■ pesticides reduces populations of pollinators ■ damage from tsunami of 2004 would have been less if the mangrove forests that protect the coasts had had not been cut down ■ Hurricane Katrina would not have caused as much flooding if the wetlands surrounding area had been left intact  Millennium Ecosystem Assessment – a project that involved more than a thousand scientists and managers worldwide to provide a global assessment of Earth's ecosystems, determine trends in the services they provide and assess their importance to human well-being ■ divided ecosystem services into 4 categories: provisioning services, regulating services, cultural services, supporting services  most important driver of alterations in ecosystems has been changes in land use as natural ecosystems have been converted to other more intensi
More Less

Related notes for Biology 3592A

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.