Kind: captions
Language: en
most of the electricity we generate
comes from fossil fuels fossil fuels
like coal oil and natural gas were
created over hundreds of millions of
years from decaying prehistoric plants
and animals buried
underground and even though they're
still relatively abundant the more we
consume the less we have and the more
difficult and expensive they are to
extract on top of that burning fossil
fuels releases greenhouse gases and
other pollutants that threaten our
health and the long-term well-being of
our planet what we need are alternative
energy sources that won't run out and
will have less of an impact on the
environment the types of Alternatives
people most often talk about are
renewable energy sources but what
exactly does that mean a renewable is a
source of energy so plent iul that it
might as well be Limitless as far as
humankind is concerned so no matter how
much of it we use there will always be
more available the most obvious
renewable is our planet's greatest
energy resource the sun the sun has
produced light and heat for more than 4
billion years and is expected to
continue to burn brightly for billions
more the energy our planet receives from
the Sun has a tremendous influence on
what happens here on Earth Not only
would it be dark and cold without it but
life wouldn't exist and without the Sun
the wind wouldn't blow and rivers and
ocean currents wouldn't flow either most
renewable Technologies use energy from
the Sun in one form or another for
example Solar Technologies collect the
sun's energy directly in the form of
light or heat other Technologies such as
wind hydroelectric and biomass
Technologies take advantage of the sun's
energy after it's been converted into
the kinetic energy of flowing air and
water or the chemical energy stored in
plants besides the Sun only two other
energy sources are plentiful enough to
be considered renewable both geothermal
energy the naturally occurring heat
coming from Earth's core and tidal
energy the movement of rising and
falling ocean tides caused by the moon's
gravitational pull have the potential to
be steady sources of energy no matter
how much we use at the moment solar and
wind power look like the most PR
promising Renewables but scientists and
Engineers are trying to find ways to put
all of these Limitless supplies of
energy to work to reduce our Reliance on
fossil fuels and create a cleaner more
sustainable
future