Though subways reduce overall pollution emissions in cities, what is good for society may not be good for the poor people who ride mass transportation. A new study finds that Canadian subways personal exposure to certain pollutants, and that Toronto has the highest levels in Canada.

Sounds awful for city dwellers, right? Breathe easy, the pollutant they measured has yet to be linked to any harm, and no acute deaths, outside government claims when they want to restrict businesses. 
Everyone knows the value of trees in the cycle of atmospheric life. They consumer carbon dioxide (CO2), the target of regulations for the last few decades.

But that's not the only way they keep us cool. Trees also impact climate by regulating the exchange of water and energy between the Earth's surface and the atmosphere, which should be important considerations as policymakers contemplate efforts to conserve forested land.
We think we know the perfect balance of gases in the atmosphere, and it involves a time before there was any industry, when the human population was tiny, when almost all of the planet was covered in plants. Basically, the dream of environmental groups today (with their members being the few allowed to live, of course.)

But we don't really know. There have been times when the carbon dioxide in the atmosphere was 10X what it is today, but we were only slightly warmed, and there were times when it was lower than today, and we were covered in ice. What we do know is that things are pretty good now, and we don't want a planet covered in ice, or to live in a greenhouse. 
Dear Mr. Trump, Please Can We Study Our Climate?

To the President-elect,


    please consider that if climate scientists of the past had not been supported by wealthy patrons we of the 21st century would know little if anything about how to warn people that a hurricane, storm surge or tornado is imminent.

Atmospheric scientists at the Desert Research Institute (DRI) have turned their attention toward the growing e-cigarette industry and found that toxic aldehydes, such as formaldehyde, are formed during the chemical breakdown of the flavored e-liquid during the rapid heating process (pyrolysis) that occurs inside e-cigarettes or electronic nicotine delivery systems (ENDS).

Since the dose makes the poison, is this a concern? Not really, but in the modern world of International Agency for Research on Cancer (IARC) hazard assessments, risk has become irrelevant and the presence of any compound, even in trace levels, is declared carcinogenic if the levels are within seven orders of magnitude, so 10,000,000 to 1.

The gusting westerly winds that dominate the climate in central Asia, setting the pattern of dryness and location of central Asian deserts, have blown mostly unchanged for 42 million years.
A University of Washington geologist led a team that has discovered a surprising resilience to one of the world's dominant weather systems. The finding could help long-term climate forecasts, since it suggests these winds are likely to persist through radical climate shifts.

Ice cream sellers Ben&Jerry's, which are a division of a giant multinational food conglomerate, seem to have a lot of marketing leeway, because they are claiming global warming is coming for your ice cream freezer.

Many nutrition groups think global warming is the best thing that could happen to their ice cream, with its loads of fat and sugar and implications for diabetes, but they are not selling to those people anyway, they are selling to fat people who like to buy organic, or people who think ice cream is health food if it was made using free-range peanut butter, or something.

For at least a billion years of the distant past, planet Earth should have been frozen over but wasn’t, and one popular notion was that methane, with 23-34 times (yes, it is unclear) the heat-trapping capacity of carbon dioxide, could have reigned supreme for most of the first 3.5 billion years of Earth history, when oxygen was absent initially. 

Environmentalists today are in a panic about greenhouse gases, but between 1.8 billion and 800 million years ago, microscopic ocean dwellers really needed them. The sun was 10 to 15 percent dimmer than it is today—too weak to warm the planet on its own. Earth required a potent mix of heat-trapping gases to keep the oceans liquid and livable.
California Governor Jerry Brown has signed a new law demanding that dairy cows stop producing so much methane. They are basically giant fracking wells on four legs, after all. 

Atmospheric scientists overwhelmingly deny the existence of a secret, elite-driven plot to release harmful chemicals into the air from high-flying aircraft, according to the first peer-reviewed journal paper to address the "chemtrails" conspiracy theory.

Researchers from the University of California, Irvine, the Carnegie Institution for Science and the nonprofit Near Zero organization asked 77 atmospheric chemists and geochemists if they had come across evidence of such a large-scale spraying program, and 76 responded that they had not. The survey results were published Wednesday in Environmental Research Letters.