humans in the biosphere (chapter 6) please set up your notebook for cornell notes
DESCRIPTION
Agriculture farming Provided a dependent source of food Lead to the development of larger communities Advances in techniques lead to crops being grown in new areas Monoculture large fields planted w/ one type of plant Chemical fertilizers and pesticides are used to increase yield The chemicals can run off and affect water supplies Green revolution evolution of modern techniques that increased world’s food supply How can we keep humans fed w/ less impact on the planet?TRANSCRIPT
Humans in the Biosphere (Chapter 6)Please set up your notebook for Cornell Notes
Human activities that impact the biosphereHunting and gathering
Hunt animals for food, gathered plant matterThe arrival of humans in North America 12,000 years ago caused the extinction of many large mammals
Agriculture farmingProvided a dependent source of foodLead to the development of larger communitiesAdvances in techniques lead to crops being grown in new areasMonoculture large fields planted w/ one type of plant
Chemical fertilizers and pesticides are used to increase yieldThe chemicals can run off and affect water supplies
Green revolution evolution of modern techniques that increased world’s food supplyHow can we keep humans fed w/ less impact on the planet?
Industrial growth and urban developmentIncrease in pollution and wasteWhat do we do with all of our trash?How can we limit pollution?
BiodiversityBiodiversity the variety of all life on the planet
Ecosystem biodiversity all the habitats, communities and ecological processes in the worldSpecies Diversity the number of different species in the biosphere
Also called species richnessHighest near the equator, lowest near the poles
All organisms in the biosphere are linked
Threats to biodiversityHuman activity can reduce biodiversity by altering habitats, hunting species to extinction, polluting and introducing foreign species into the environment
Some of these activities lead to extinctionSpecies that are at risk of going extinct are considered endangered
Foreign species that reproduce quickly and threaten native species are called invasive speciesConservation wise use of natural resources, including preserving habitats and wildlife
Global Climate ChangeGases in atmosphere help trap heat from the sun much like a green house called green house effect
Necessary for lifeEvidence of global warming
Geological record shows Earth’s climate has changed repeatedly in history
How have how human activities contributed to climate change?Increasing levels of CO2 in the atmosphere
Possible effects of global climate changeIncrease in average global temperature 1-2 CCould cause flooding of coastal areas as ice caps meltIncreases in extreme weather
Drought, snow, hurricanesExtinction of organisms that cannot adapt to new, higher temps.