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The Earth is a massive ecosystem in which the living and non-living worlds interact through four major subsystems - the atmosphere, hydrosphere, geosphere and biosphere.

Hydrosphere - All of the planet's waters, except for moisture in the atmosphere.

Geosphere - The soil and the extreme upper portion of the continental crust

Biosphere - Includes all living organisms from plants, mammals, birds, reptiles, aquatic life, insects to bacteria and viruses.

Left on itself, the Earth is a self-sustaining and balanced ecosystem, with climate change occurring gradually through certain natural processes. With the advancement of mankind and technology, however, the Earth's climate has witnessed several alterations driven excessively by mankind. Hence the causes of climate change can be broadly partitioned into Natural factors and Human factors.

1. Natural
    a) External Changes (from extraterrestrial systems):
        i)    Changes in Solar Output
        ii)   Changes in the Earth's Orbit
    b) Internal Changes (from oceans, atmosphere and land systems)
        i)    Changes in the concentrations of atmospheric gases - Greenhouse Effect
        ii)   Natural processes on the Earth --  Mountain Building, Continental Drifts, Atmospheric/Ocean Heat Exchanges

2. Human
    a) Enhancing the Greenhouse Effect - increase CO2 emissions through fossil fuel combustions
    b) Forms of Land Uses
        i)      Irrigation
        ii)     Deforestation
        iii)    Agriculture

References:

Answer.com.(2008). Definition of ecosystem. Retrieved 03 Nov 2008 from http://www.answers.com/ecosystem&r=67

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1.	Climate Change
1.1 1.2 1.3	Definition Causes Impacts of Climate Change
2.	ICT as a Solution to Climate Change
2.1 2.2 2.3	Achieving a Green Business through ICT 2.1.1 ICT in Manufacturing Sector 2.1.2 ICT in Transport Sector 2.1.3 ICT in Building Sector 2.1.4 ICT in Power Sector 2.1.5 Case Studies Role of the Internet in Promoting Green Awareness Other Spinoffs from the Advancement in ICT
3.	Limitations of ICT in Fighting Climate Change
3.1 3.2 3.3	Freedom of Expression ICT's Two-fold Role Inability of ICT to stand as an Independent Solution
4.	Ongoing Research and Development of ICT in fighting Climate Change
4.1	Conference Talks
5.	Quotes on ICT and Climate Change
5.1	Quotes
6.	References