Www.Saveearth.Info Eco Quiz

CO2 is the symbol for carbon dioxide.

Particles smaller than 2.5 micrometers pose the most serious risk since they can bypass many of the bodies immune responses and pass deep down into the lungs.

Air pollution can be caused by liquids, solids and gases.

Current estimates put the figure at around 92% - it's a staggering proportion of us who live in a polluted air environment.

Most plastics degrade over a much longer time frame, estimates range from between 500 - 1000 years. Some plastics may take considerably longer.

The WHO report stated that some 72% of premature deaths were associated with ischaemic heart disease and strokes.

The typical time is 4-7 days although some aerosols can remain in the atmosphere for years.

Freshwater is roughly 69% attributable to glaciers and ice caps, 30% groundwater and 1% surface water.

Surprisingly, indoor air pollution causes more deaths.

Particles are typically 1-1000 nanometers in diameter. One billion nanometers fit into one centimeter!

The background rate accounts for 5 species extinctions per year - by definition this means that current species extinction rates fall around the 5,000 - 50,000 per annum mark.

Based on data from the United Nations Food and Agriculture Organisation.

NASA quotes a confidence value in excess of 95%, the Bill Nye National Geographic video puts the number at 97%.

The current decline is being referred to as the 6th mass extinction.

So says the Encyclopedia Britannica.

It's 75% and the proportion is slowly rising all the time as manufacturers strive for sustainable solutions.

The International Union for the Conservation of Nature (IUCN) is an international organisation that compiles data on endangered animals and places them into different threat categories. Well done if you got this one right - it's a toughie!

According to a 2010 Nature report, the figure is 80%.

Up to 80% of deforested land in the Amazon is now used for pasture. The cattle industry has ballooned since the 1970's, giving Brazil the largest commercial cattle herd in the world.

For those that selected water vapour, surprisingly, it is the most abundant greenhouse gas.

According to National Geographic, around 70% is produced by marine organisms.

99.9% of all species that have ever lived are now extinct.

The Industrial Revolution was the transition to new manufacturing processes in the period from about 1760 to sometime around 1820. This transition notably included going from hand production methods to machines and saw the start of rapid fossil fuel use.

According to NASA, it is 30%.

According to The Millennium Ecosystem Assessment report which gathered data between 2001-2005.

According to the WWF, the illegal wildlife trade is the fourth largest illegal trade behind drugs, people smuggling and counterfeiting.

According to the United Nations, 48% is caused by subsistence farming and 32% from commercial agriculture making 80% in total.

Earth has lost half of its wildlife in the past 40 years, says WWF.

It's 'only' 10%. Most aerosols released into the atmosphere are naturally generated from sources like volcanic activity and forest fires.