unit 7-2 notes mr. hefti – pulaski biology. global warming ► global warming ► what is it?...
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Global Warming ► Global Warming ► What is it? Increasing average global temperatureTRANSCRIPT
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Global Warming & Invasive Species
Unit 7-2 NotesMr. Hefti – Pulaski Biology
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Global Warming ► What is it?
• Increasing average global temperature
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GW ► What causes it?
• Humans add CO2 and other greenhouse gases to atmosphere causing heat retention
• Specific factors:– Burning fossil fuels– Deforestation
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GW ► Why is it bad?
• Shifting climate patterns• Rising sea levels• Altered ecosystems
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GW ► What can be done about it?
• Reduce dependency on fossil fuels• Halt the destruction of world’s forests• Plant trees
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Invasive Species ► What is it?
• When non-native organisms are released to an ecosystem– Can be accidental or intentional
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IS ► What causes it?
• Exotic organisms usually transported unknowingly
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IS ► Why is it bad?
• No natural enemies in new ecosystem– Can therefore out-compete natives– Crowd out, feed on or eliminate native species
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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