350 parts per million. 350, the most important number on earth.

This imbalance, if we want to stabilize climate, means that we must reduce CO2 from 391 ppm, parts per million, back to 350 ppm.

Description It is able to tolerate soils with copper concentrations of up to 15,000 ppm, and soils with nickel concentrations of almost 5000 ppm.

For example, herring contains mercury levels at about 0.1 parts per million, while shark contains mercury levels greater than 1 part per million.

If we are to have a good chance of achieving that target, the concentration of CO2 must not be allowed to exceed 450 parts per million (it is now nearly 390 ppm).

Nature naturally has allowed carbon dioxide to go up to 280 parts per million.

When the first IPCC report was published in 1990, the concentration of CO2 in the atmosphere had reached 354 parts per million (up from the preindustrial baseline of 280 ppm).

A portion of the 1 million would be used to produce videotapes

Right now, if you look at the top right part of that graph, we're at 385 parts per million.

The name comes from the number of parts per million of carbon dioxide in the atmosphere that, according to Jim Hansen, perhaps the world s leading climate scientist, we should not exceed if we are to avoid potentially catastrophic climate change. It is a measure of the seriousness of our problem that CO2 is already at 386 ppm, and is rising by two ppm each year.

This compared to an average level of 4 ppm for people living outside the Minamata area.

The salt concentration is usually expressed in parts per thousand (permille, ) or parts per million (ppm).

A classic example is James Hansen, a NASA climatologist pushing for 350 parts per million carbon dioxide in the atmosphere.

A more recent study suggested even higher CO2 concentrations of up to 3180 parts per million.

The last time CO2 was 390 ppm, today's value, sea level was higher by at least 15 meters, 50 feet.

Rare earth elements change through time in small quantities (ppm, parts per million), so their proportion can be used for geochronology and dating fossils.

Only 155 ppm include deuterium ( or D), a hydrogen isotope with one neutron, and fewer than 20 parts per quintillion include tritium ( or T), which has two.

This is regularly several hundred parts per million.

Maybe one in a million might be but...

A classic example is James Hansen, a NASA climatologist pushing for 350 parts per million carbon dioxide in the atmosphere.

This means that between one million and 1.5 million Sunnis have fled the capital.

Within just 50 years that's one hundredth of one millionth of the Earth's age the amount of carbon dioxide in the atmosphere started to rise, and ominously fast.

It has been estimated that the solid earth as a whole contains 730 ppm of carbon, with 2000 ppm in the core and 120 ppm in the combined mantle and crust.

She is an active member of the One Million Signatures Campaign.

80 parts per million hydrogen sulfide.

At the rate of about two and a half parts per million per year.

The last time CO2 was 390 ppm, today's value, sea level was higher by at least 15 meters, 50 feet.

Like a million.

Within just 50 years that's one hundredth of one millionth of the Earth's age the amount of carbon dioxide in the atmosphere started to rise, and ominously fast.

Getting back to 350 pars per million will be very very tough, the toughest thing human beings have ever done, but there is no use complaining about it, it's just physics and chemistry.

What's at the end of a million? Zero. Nothing.

Lately, I would bet it was one in a million.

As the NASA team put it in January 2008, any value in the atmosphere greater than 350 parts per million is not compatible with the planet on which civilization developed and which life on earth is adapted.

One in a million, one in a billion they're both almost never.

For chemicals, the chemical regulation is usually expressed in parts per million (ppm), or sometimes in milligrams per cubic meter (mg m3).

But in just a tiny sliver of the Earth's history, the last one millionth part, a few thousand years, the patterns of vegetation altered much faster than before.

These human induced alterations occupying overall less than a millionth of the elapsed lifetime and seemingly occurring with runaway speed?

A million years ago?

Well, the million dollar question. What will happen in the Arab world?

A million to one shot. You even greased the doors.

The evidence also shows that contamination levels are extremely variable, ranging from non detectable amounts to 810,000 ppm.

Stronger still if you know that outside today, the atmosphere is 395 parts per million CO2.

Each pressure receptacle containing a toxic by inhalation liquid with an LC50 less than or equal to 200 ml m3 (ppm) shall be closed with a plug or valve conforming to the following

Well, pretty much all serious scientists agree that we need to reduce the amount of carbon in the atmosphere to three hundred fifty parts per million if we want to avoid climate disaster.

The losses totalled 6.7 million, consisting of 1.9 million in vehicles and trailers, 0.4 million in communications equipment, 3.5 million in shelters, 0.6 million in generators and 0.3 million in miscellaneous equipment.