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renewable energy alternative energy sources (solar energy (solar thermal…
renewable energy alternative energy sources
solar energy
active: pumps heat absorbing fluid
passive: absorbs from sun directly
solar thermal systems
moving mirrors
parabolic mirrors
for cooking
decreases the need for firewood
hydropower
pros
low cost electricity
low emissions of co2 and air pollutants
large untapped potential;
highness energy
cons
high methane emissions
people displacement
high land disturbance
disrupts aquatic ecosystems
transition to renewable energy
enviro benefits
saves lives by reducing air pollution
economic benefits
save and create jobs
priorities
improve energy efficiencies
hydrogen
cons
negative net energy
create need for subsidies
pros
good water
no co2 emissions
geothermal
pros
medium net energy
low co2 emissions
cons
not many hydrothermal sites
expensive drilling
windpower
cons
needs backup/storage system when there is no wind
visual pollution
low level noise
kill birds
pros
high net energy
widely available
low electricity cost
low to non direct emission of co2 and air pollutants
easy to build and expand
energy efficiency
energy conservation
low to non waste of energy
avoid loss
energy efficiency
useful work per unit of energy
improve
power plants
transportation
buildings
bio mass
solid biomas
pros
availability
costs
med net energy
plantation helps restore degraded lands
cons
loss of wildlife habitats
water pollution
deforestation may cause soil erosions
invasive species
high co2 emissions if harvested and burned unsisrtsinably
liquid biomas
pros
low co2 emissions
med net energy
med net energy for ethanol from sugar cane
cons
fuel crops can compete with food crops for land
invasive species
low net energy
high co2 emission from corn ethanol
biodigest
pros
low landfill waste
low human + livestock waste
cheap
creates jobs
cons
low net energy
impurities can damage idf used in combustion engines
renewable energy
priorities
improve energy efficiency
reduce waste
enviro benefits
save lives with low air pollution
decrease climate change
slow increase in ocean acidity
economic benefits
save money
create jobs
business op