The air pollution that people in Colorado inhale each day comes from myriad sources: factories, cars, buildings and homes, fossil fuel facilities, cattle feedlots.
If, as a number of Sierra readers suggested, population is the elephant in the room, then our addiction to fossil fuels is a Tyrannosaurus rex about to devour us all.
"The physical effects of climate change, population growth, and urbanisation mean that without effective action more Australians' livelihoods will be impacted by disasters into the future and the cost of those disasters will continue to grow."
Population growth is leveling off in most areas due to rising affluence and advances in women's education and family planning.
Population growth, more intense rainfall and melting ice are likely to cause more frequent and severe floods, researchers warned on Tuesday.
Promoting contraceptives in fun ways achieved tremendous success towards breaking taboos and clarifying misconceptions. Together with creative community development programs, family planning programs increased the wellbeing of all Thais.
"Climate change, human population growth, exploitation of natural resources, and habitat loss all pose major threats to the precious balance of our natural world," he said.
The brain-harming metal is discharged directly into the river and carried to it on air currents. Some argue authorities are doing too little to stop both routes of pollution.
EHN.org investigation finds regulatory push to discredit independent evidence of harm while favoring pro-industry science despite significant shortcomings.
"The scary part is that most people who fish are not aware of these advisories although there are notices with fish and wildlife agencies"