Unit 7-2 Notes Mr. Hefti – Pulaski Biology. Global Warming ► Global Warming ► What is it?...
-
Upload
adele-mathews -
Category
Documents
-
view
223 -
download
0
description
Transcript of Unit 7-2 Notes Mr. Hefti – Pulaski Biology. Global Warming ► Global Warming ► What is it?...
Global Warming & Invasive Species
Unit 7-2 NotesMr. Hefti – Pulaski Biology
Global Warming ► What is it?
• Increasing average global temperature
GW ► What causes it?
• Humans add CO2 and other greenhouse gases to atmosphere causing heat retention
• Specific factors:– Burning fossil fuels– Deforestation
GW ► Why is it bad?
• Shifting climate patterns• Rising sea levels• Altered ecosystems
GW ► What can be done about it?
• Reduce dependency on fossil fuels• Halt the destruction of world’s forests• Plant trees
Invasive Species ► What is it?
• When non-native organisms are released to an ecosystem– Can be accidental or intentional
IS ► What causes it?
• Exotic organisms usually transported unknowingly
IS ► Why is it bad?
• No natural enemies in new ecosystem– Can therefore out-compete natives– Crowd out, feed on or eliminate native species
IS ► What can be done about it?
• Laws restrict the transport of organisms• Pesticides used against many invasives• Releasing natural predators may reduce
invasive population