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“The plants are our greatest friends. They give us oxygen to breathe, food, water, shelter, medicine, and even fuel. You may enslave a pet with domesticity, a dog or cat, but eventually when the food runs out, they will be gone, by choice. The plants, however, never leave us. Perhaps that is why they have already begun to reduce carbon dioxide, the gas of life, and sunlight by way of chemical trails in the sky.”
― Jack Freestone

“Greenhouse gases, like carbon dioxide, absorb infrared energy and help warm the planet. So they're absolutely crucial. The problem is that their concentration in the atmosphere needs to be regulated as the sun slowly brightens. Otherwise, the Earth would not be able to stabilize its surface temperature, which would be disastrous.

Plate tectonics cycles fragments of the Earth's crust -- including limestone, which is made up of calcium, carbon dioxide, and oxygen atoms -- down into the mantle. There, the planet's internal heat releases the carbon dioxide, which is then continually vented to the atmosphere through volcanoes. It's quite an elaborate process, but the end result is a kind of thermostat that keeps the greenhouse gases in balance and our surface temperature under control.

--Guillermo Gonzalez, Ph.D. (astronomer & physicist)”
― Lee Strobel, The Case for a Creator: A Journalist Investigates Scientific Evidence That Points Toward God

“Worldwide, animal agriculture emits more carbon dioxide than any other single source.”
― Lisa Kemmerer, Eating Earth: Environmental Ethics and Dietary Choice

“I regard breathing industrial gas to be as harmful as heavy smoking.”
― Steven Magee

“DNA floats in the carbon dioxide of life.”
― Anthony T. Hincks

“The trees are full of life, both living and deceased.”
― Anthony T. Hincks

“Have you ever wondered what happens to the parts that go up in smoke during a cremation?
The answer is in the trees.”
― Anthony T. Hincks

“My neurological doctor thought I had a brain tumor before I self-diagnosed and treated for ‘Magee's Diseaseâ€�. He sent me through CT and MRI brain scanners looking for it. I later discovered I had ‘Altitude Hypersensitivity' and I was very reactive to altitudes above 1,000 feet, bringing on severe altitude sickness symptoms that were affecting the brain. I had been breathing oxygen, nitrogen, helium, carbon dioxide and mercury polluted air at high altitude during a decade of working in professional astronomy.”
― Steven Magee