The world climate is mainly divided into five parts:
- Tropical humid climates: It exist between tropic of cancer and tropic of Capricorn. Annual range of temperature is very low and rainfall is high.
- Tropical wet climate: It is found near the equator. The major areas are South America and western equatorial Africa. Rainfall occur in every month of year. The maximum and minimum temperature in a day is 30 and 20 degree Celsius respectively.
- Tropical monsoon climate: It is found over the Indian sub continent, North Eastern part of South America and northern Australia. Heavy rainfall is in summer in this climate
- Dry climate:A large area of latitudes from 15-60 degree north and south of the equator comes under this climates they have very low rainfall that is not sufficient for the growth of the plants
- Warm temperature climates: these climates start from 39-59 degree of latitude mainly on the eastern and western continents. They have warm summers with mild winter
- Humid sub Tropical climates: These occur mainly in Northern Indians plains and south china interior plains.
- Cold snow forest climates: It occur in the large continental area in the northern hemisphere between 40-70 degree north latitudes in Europe , Asia and North America.
- Cold climate with humid Winters: It occurs poleward of marine coast climate.
- Cold climate with dry Winters: This occur in northern Asia. Winter temperature are very low may be below freezing for upto 7 months in a year.
- Polar climates: it exist poleward beyond 70 degree latitude
- Tundra climate: This is the region of permafrost where subsoil is permanent frozen. In summers they have long duration of day light.
- Tundra climate: These are found over interior of Greenland and Antarctica. In summer, the temperature is below the freezing point.
The gases that absorb long wave length radiation are called greenhouse gases. The process that warm the atmosphere are often collectively is known as green house effect.
These are carbon dioxide, chlorofluorocarbons, methane, nitrous oxide, ozone etc. The largest Concentration of GHG's in the atmosphere is carbon dioxide. CO2 comes mainly from fossil fuels combustion. Forest and oceans absorb the CO2.