請幫我作文法訂正及語意流暢急！ - 暖化

我寫的兩段英文
第一段說明飼養牲畜對地球暖化的影響
第二段是對環境的影響
兩段都很簡短, 但總覺得很不通順
請高手幫幫我把他訂正ㄧ下
感恩
In particular, raising livestock, especially for cows, can increase carbon dioxide and methane emission. According to the latest United Nations reports, in fact, the existing 1 billion and 50 million cows on the earth is the biggest source of carbon emission. Escape of gas, faeces and belch breaking-out through digestion will produce more than 100 kinds of pollutants, and one of which is ammonia emissions, which accounts for 60% of total been produce on earth, whatever from human activities or all living creatures. Ammonia is the leading cause of acid rain. The other main pollutant is methane, which is very powerful greenhouse gas, accounts for 30% of total been produced on the earth, and it is much more damaging and can warm the earth by 20 times powerful than carbon dioxide. The more livestock we raise, the more pollutants been produced and significantly they intensify greenhouse effect.
To raise livestock will also damage to lands and water, and this will affect the ecological balance system. First farmers have to build new pastures from one area to another, and this is main reason for deforestation. Second, to raise livestock excessively leads the meadows and pastures turning to deserts. The livestock sector is also a key play in polluting waters. Waste from livestock and manure enter the rivers or ocean increase huge amount of algae in the water, which is a main cause to threaten creatures down there. More seriously, toxic elements such as antibiotics or hormones that go into the waters not only threaten human health, but also kill the treasures in the ocean, for example, coral reefs. These are the facts that influence the balance among all living creatures.