B.the impact on the environment that humans have is stuff like pollution, killing off trees to biuld bildings. this is not good because it is takeing away the animals habbitat. so we are not going to have that much animals if we keep on destroing there stuff. if we pollut the air it could cause the animals to be born and not be right.if we dump our waste in waters and all of that stuff then we could see that we would not be able to eat the fish in the water because it is polluted.
C. the life cycle of gas is when it goes throght many different stages. the production of nateral gas in when you mine is like u would gold.the paciging is when it goes throgh a line in to your house for many thinks. like a stove a heater. there are many more.it is desoped of by it being burned up by the stove or what ever else you use that uses gas. the pollution is that it is not good to inhale. it could make you relly sick.
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A-B-C. http://www.nrel.gov/docs/fy00osti/27715.pdf
1-2-3. http://www.google.com/images?um=1&hl=en&tbs=isch%3A1&sa=1&q=packiging+gas&aq=f&aqi=&aql=&oq=&gs_rfai=