Sun tanning However, it operates not by inducing direct DNA damage, but by producing reactive oxygen species which damage DNA indirectly. UVA (see above) induces a cosmetic tan but little extra melanin protection against sun damage, sun burn, or cancer. Ultraviolet B (UVB) radiation is in the wavelength range 280 to 320 nm. Much of this band is blocked by the Earth's ozone layer, but some penetrates. UVB: A person's natural skin color affects their reaction to exposure to the sun. An individual's natural skin color can vary from a dark brown to a nearly colorless pigmentation, which may appear white .
Flash-gas (petroleum) classified by their ability to absorb and emit radiation energy in atmosphere. This process of energy capture and release is what allows for the greenhouse effect, when energy trapped within the gas causes a resulting warming of the atmospheric temperature. Greenhouse gases are necessary for keeping our atmosphere warm enough to sustain life but also serve as a medium for over-heating to occur, a phenomenon referred to as global warming. GHGs are produced both directly and indirectly during many production phases of the oil and gas industry. It is estimated that 90% of GHG emissions from fossil fuels is due