The compare to 18% for livestock, this is because

     The world’s climate scientists tell us that highest safe level of
emissions would be around 350 parts per million of carbon dioxide greenhouse
gasses in the atmosphere were already at 400. They tell us that the sort of
safest we could hope to do without having perilous implications as drought,
famine human conflict major species extinct would about at 2 degrees Celsius
increases in temperature. We are rapidly approaching that and with all the
built-in carbon dioxide that’s already in the atmosphere. We are facing the
next major extinction of species on the earth that we haven’t seen since the
time of the dinosaurs disappearing. When the whole countries go under water
because of sea level rise and the whole countries find that there’s so much
drought that they can’t feed their population and as a result, they need to
desperately migrate to another country or invade another country. which mean
we’re going to have climate wars in the future.

    
The United Nations stating that cows produce more greenhouse gases than
the entire transportation sector this means that raising cattle produces more
greenhouse gases than all cars, trucks, trains, boats, planes combined 13%
compare to 18% for livestock, this is because cows produce a substantial amount
of methane from their digestive process methane gases from livestock is twenty
five to a hundred times more destructive than carbon dioxide from vehicles
hydraulic fracturing for natural gas uses an incredible amount of water a
staggering a hundred billion gallons of water is used every year in the united
states, but when compare this with animal agriculture raising livestock just in
the United State, consumes 34 trillion gallons of water and it turns out the
methane emissions from both industries are nearly equal one quarter pound
hamburger require over 660 gallons of water to produce here. Most people have
been taking those short showers trying to save water and to find out just
eating on hamburger is the equivalent of showering to an entire month. So much
attention is given to lowering our home water use yet domestic water use is
only 5% of what is consumed in the US vs. 55% for animal agriculture. That’s
because it takes upward of 2500 gallons of water to produce one pound of beef.
In 2009, two advisors from the World Bank released an analysis on human induced
greenhouse gases finding that animal agriculture was responsible not for
eighteen percent as UN stated but was actually 51 percent of all greenhouse
gases, which makes animal agriculture the number one contributor to human
caused climate change. Moreover, the analysis also found that raising animals
for food consumes a third of all the planets freshwater occupies up to 45
percent of the earth’s land is responsible for up to 91% of Amazon destruction
is a leading cause of species extinction, ocean dead zones in habitat
destruction. Yet the world’s largest environmental groups that are supposed to
be saving our world didn’t mention this anywhere. (UN New Centre, rearing
cattle produces more greenhouse gases than driving cars, UN report warns)

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UN reported that three-quarters of the world’s fisheries are
overexploited, fully exploited or significantly depleted due to overfishing. The
report also claim that the oceans are under siege like never before and marine
environments are in trouble and if people do not do something about it,  humans are going to see fishless oceans by
the year 2048, which is the perdition from scientists. On another hand, an
international marine wildlife conservation organization, Sea Shepherd
Conservation Society reported that the wave fishing is done today to feed the
demand for 90 million tons of fish is primarily through massive fish nets for
every single pound of fish caught there’s up to 5 pounds of untargeted species
trapped such as dolphins whales, sea turtles and sharks, and this is what
happening in our oceans every single day. “The oceans die, we die.” Watson, the
Founder captain of Sea Shepherd Conservation Society said, “That’s not a
tagline but a truth.”

    
Beside the ocean, the other ecosystem that is being destroyed at a such
rapid rate of the world is rainforests. The global rainforests are essentially
the planets lungs, they breathe in CO2 and exhale oxygen an acre of rainforest
is cleared every second and the leading cause is to graze animals and grow
their feed crops. That is essentially an entire football filed cleared every
single second and estimated that every day close to a hundred of plants,
animals and insect species are lost due to rain forest destruction. So, the
fact is there was no way to sustainably raise enough animals to feed the
world’s current demand on meat. Dr. Will Tuttle, an environmental and ethics
author, reported that human is growing enough food right now to feed between
twelve and fifteen billion people, and there actually only have seven billion
people in the world but there still roughly a billion of people starving every
single day because worldwide 50% of the grain and legumes that were growing to
feed the animals, which means the animals are eating a huge amounts of grain
and legumes. In the U.S., it is more like closer to 70% of food to feed
animals. In addition, 82% of the world’s starving children live in countries
where food is fed to animals in the livestock system that are than killed and
eaten by more well-off individuals in developed countries. (“Food Choice and
Sustainability”, Richard Oppenlander, Environmental Researcher.)

    
Vegetarian or vegan could be very healthy. Elders who are or became
vegan for many years are more likely able to handle heavy capacity of exercise.
(Dr. Michael A. Klaper,MD, Physician, True North Health Center). Dr. Michael
also suggested that people should not be consuming dairy. The purpose of cow’s
milk is to turn a 65-pound calf into a 400-pound cow as rapidly as possible,
cow’s milk contains of everything that for baby calf’s growth, such as the
hormones, the lipids, the proteins, the sodium and the growth factors. So, the
cow’s milk should be baby growth fluid but should not be human’s food.

    
Thus, people should go into vegan to save the earth.