Greenhouse Gases: A greenhouse gases (sometimes abbreviated GHG) are gases in an atmosphere that absorbs and emits radiation within the thermal infrared range.
Carbon Dioxide: Carbon dioxide enters the atmosphere through the burning of fossil fuels (oil, natural gas, and coal), solid waste, trees and wood products, and also as a result of other chemical reactions (e.g., manufacture of cement). Carbon dioxide is also removed from the atmosphere (or "sequestered") when it is absorbed by plants as part of the biological carbon cycle.
Sun’s Harmful UV Rays: Is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays.
Industrialization Era: Was a period in which fundamental changes occurred in agriculture, textile and metal manufacture, transportation, economic policies and the social structure in England.
Natural Cycle: Is the natural process of narure that all living thing pass thought(cycle process).
http://en.wikipedia.org/wiki/Natural_environment
http://earthobservatory.nasa.gov/