It’s estimated that 30 billion tons of carbon is emitted each year by motor vehicles, factories, deforestation and other sources. About 40% of the gas accumulates in the atmosphere, with the rest apparently being absorbed by oceans and forests.
Source [Hindustan Times]
The above graph shows the total CO2 emission in million tons by country for the year 2002. Data source was the World Resources Institute (WRI). The CO2 emissions for the year 2006 are about 12 to 15% higher than the figures shown here.
Source: timeforchange.org
A tree takes up about 2.52 lbs, or about 1150 grams of carbon dioxide daily on average[1]. This means that roughly one 25-year-old tree is required to take up CO2 exhaled by an average man and sustain bare breathing.
A conservative estimate based on a person who spends eight hours a day sleeping and 16 hours in normal activities, but one who does not add to the atmospheric burden by exercise, would thus come to about 456 liters of carbon dioxide a day, or 166,440 liters every 365 days.[2]
Approximately 912 grams per day.
1. ^ Tufts Climate Initiative. ““Sequestration: How much CO2 does a tree take up?””. Retrieved on 2008-08-09.
Biogas typically refers to a gas produced by the biological breakdown of organic matter in the absence of oxygen. Biogas is comprised primarily of methane and carbon dioxide. Biogas originates from biogenic material and is a type of biofuel. Biogas is a product of the anaerobic digestion or fermentation of biodegradable materials such as manure or sewage, municipal wasteand energy crops. The methane in biogas gives it the ability to be used as a fuel. The combustion of which releases energy.
Table 1. Average composition of reactor biogas.
Matter
%
Methane, CH 4
55-75
Carbon dioxide, CO 2
25-45
Carbon monoxide, CO
0-0,3
Nitrogen, N 2
1-5
Hydrogen, H2
0-3
Hydrogen sulfide, H 2 S
0,1-0,5
Oxygen, O 2
traces;
Table 2. Average composition of biogas recovered at a landfill (landfill biogas).
Matter
Content
Methane, CH 4
54 %
Carbon dioxide, CO 2
42 %
Oxygen, O 2
0,8 %
Nitrogen, N 2
3,1 %
Chlorine (total 2 )
22 mg/ m³
Fluor (total F 2 )
5 mg/ m³
Hydrogen sulfide, H 2 S
88 mg/m³
Calculation of the thermal value of the recovered biogas (methane 65%) 
If reactor produces 2000m³ of biogas per day, the contained heat capacity may be calculated as follows: 
Operating efficiency of the utilisation of the produced biogas effects decisively the amount of the energy produced.
If a biogas plant uses all the produced biogas for joint production of energy and heat, the amount of energy produced during a day will total 10.94 MWh 
Jatropha, a shrub that grows in any arid land and can be used to make diesel.— on Wikipedia. Jatropha in India
Wind energy generation in 2006 was approximately 150 Terrawatt hours (TWh) or roughly 1% of global supply.
Global experts predict a 24-27% growth for the next 5-7 years, making wind energy a $35 billion industry.
India ranks 4th in the world with a total wind power capacity of 6,270 MW in 2006.
Wind Power generates 4.64% of all electricity produced in India.
India alone has the potential to harness 45,000 MW of wind energy compared to its current 6,270 MW.
India rcvs about 5000 trillion KWh eq. of energy/yr through Solar Radiation.
Just 1% of the Country’s land area can meet its entire electricity requirements till 2030
In 2007, Solar Energy production in India was 80 MW peak power (MWp) just 1.7% of the World total of 4700 MWp.
Setting up a 5 KW Solar Power plant requires 60-80 sq ft of area and Rs. 18-20 lacs for installation.
Calculations: Total land area in India = 2,973,190 square kilometers. 1% = 29,732 sq kms
60-80 sq ft area = Rs. 18-20 lacs 1 sq ft area = Rs. 0.3 lacs
60-80 sq ft area gives 5 KW Solar Power 1 sq ft area gives 83.33 Watts Solar power
1 km = (1000/0.3) ft 29,732 kms = 99,106.67 x 10^3 ft so, 29,732 sq kms = 99,106.67 x 10^3 sq ft
Hence, Total installation cost for 99,106.67 x 10^3 sq ft = Rs. 29,732,000 lacs and, 99,106.67 x 10^3 sq ft area will give 8260 MW power !! ONLY?
