Question

I want a very complex answer in this question. Only users who have 200+ answers in biology.
State briefly about fossil fuels as I am interested in that.
Don't copy from website I want your opinion on it that too a hard thinking one.
Thanks for the answer.

Answer 1

They are nonrenewable conventional energy resources found inside earth's crust where they have been formed through heat and compression on forests and other organic matter buried underneath due to earthquakes, landslides, lava, etc. Since, they were formed in some particular periods, their presence underneath can be known due to specific known due to the embedded palynofossils/microfossils.
Fossil fuels can be solid (coal, lignite), liquid (petroleum) or gaseous (natural gases). The oldest coal deposits are anthracite (80% deposited carbon, dated to 300 million years back). Others are lignite (50-60% carbon) and famously known bitumen (less than 40% carbon).
They meet 70% of total energy needs of the world and 87.4% of all commercial energy.
Per captia index of energy consumption is MTOE (metric tonnes of oil equivalent). It is maximum for Canada (9.15 MTOE), high for our own country U.S.A (7.3 MTOE), medicare for Britain and France (3.8 MTOE) and exceptionally low for India (0.5 MTOE).
Since India is very low on the index, let's talk about India (as far being my favorite country); In India 58% of commercial energy is got from coal and 38% from petroleum along with natural gas. Coal is used for cooking, heating, in industry and thermal power plants. Petroleum is used for transport, agriculture and some industries. LPG or liquefied Petroleum gas are employed for both cooking and in industry (as it is a natural gas). Fossil fuel resources are, however, limited. Coal resources and natural gas may last for over 100 years. Good coal reserves occur in U.S.A. (good for us), China, Russia and India (Bihar, Bengal, odisha and Madhya pradesh). In future, it may be liquefied. A lot of natural gas goes waste (some 24% in India and 3% in U.S.A.).

Known reserves of Petroleum are expected to last upto 2030 A.D. Major reserves occur in Nigeria, Libyan, Iran, Iraq, Saudi Arabia, Kuwait, U.S.A., Russia and China. In India, Petroleum reserves are low, being mainly present in Assam, Gujarat, Bombay High and Narmada Basin. They do not meet even 50% of total Petroleum requirement.

Despite limited reserves, demand for fossil fuels is rising, annually by 6%on global basis and 15% in India. Therefore, conservation of fossils fuels, prevention of their excessive wastage and alternate sources of energy are urgently required. Gasification of coal, compressed natural gas (CNG), gasohol (petrol + alcohol) are being consecutively tried on a huge scale in major parts of United States of America and Brazil.