The gases that cause the greenhouse effect are Carbon dioxide (60% effect) and Methane (20% effect).
Thus, carbon dioxide and methane are the major greenhouse gases.
The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson units (DU).
Noise is measured in decibels.
Biomagnification, also known as bioaccumulation, is the increasing concentration of a substance, such as a toxic chemical, in the tissues of organisms at successively higher levels in a food chain.
Electrostatic precipitator can remove over 99% particulate matter present in the exhaust from a thermal power plant.
CNG is cheaper than petrol and it burns more efficiently unlike petrol or diesel.
It also cannot be adulterated like diesel and petrol.
The same diesel engine cannot be used in CNG buses for making the cost conversion low.
The thickness of the ozone in a column of air from the ground to the top of atmosphere is measured in term of Dobson unit (1 DU = 1ppb).
UV-B radiations damage DNA and mutations may occur.
In human eye, cornea absorbs UV-B radiations, and a high dose of UV-B causes inflammation of cornea called snow blindness.
Montreal protocol – Signed in 16 Sep, 1987 (Ozone day) came into force – 1 Jan, 1989.
It was aimed at stopping the production and import of ODS and reduce their concentration in the atmosphere.
In majority of aquatic plants, the flowers emerge above the level of water.
These may be pollinated by insects or wind eg.: Water hyacinth and water lily.
It is recommended that nuclear wastes should be stored after pre-treatment in suitable containers, which should then be buried in rocks.
