In one year, a mature leafy tree produces as much oxygen as ten people breathe. If phytoplankton provides us with half our required oxygen, at current population levels we could survive on Earth for at least 4000 years before the oxygen store ran empty.
FILTHY AIR: Without trees, humans would not be able survive because the air would be unsuitable for breathing. If anything, people would have to develop gas masks that filter the little oxygen that would be left in the air.
Without trees, forest areas would become drier and more prone to extreme droughts. Oxygen - carbon dioxide cycle would be disturbed. Due to the absence of the firm roots of these trees and the barrier effect they provide, heavy rains would lead to frequent flooding.
Trees are often considered valuable, because they produce oxygen during photosynthesis, but most of the oxygen in the atmosphere is produced by phytoplankton in the ocean. Without trees, we would still have enough oxygen to survive.
A human breathes about 9.5 tonnes of air in a year, but oxygen only makes up about 23 per cent of that air, by mass, and we only extract a little over a third of the oxygen from each breath. That works out to a total of about 740kg of oxygen per year. Which is, very roughly, seven or eight trees' worth.
The Earth has become five percent greener in 20 years. In total, the increase in leaf area over the past two decades corresponds to an area as large as the Amazon rainforests.
As trees grow, they help stop climate change by removing carbon dioxide from the air, storing carbon in the trees and soil, and releasing oxygen into the atmosphere. Trees provide many benefits to us, every day.
All plant and animal life on Earth need oxygen to survive.
In reality, the world won't run out of water. Water does not leave Earth, nor does it come from space. The amount of water the world has is the same amount of water we've always had. However, we could run out of usable water, or at least see a drop to very low reserves.
At the current rate of solar brightening—just over 1% every 100 million years—Earth would suffer this "runaway greenhouse" in 600 million to 700 million years. Earth will suffer some preliminary effects leading up to that, too.
To breathe
They are vital in ensuring that our atmosphere remains oxygen-rich. Trees produce oxygen for us to breathe.
The gravitational pull of the moon moderates Earth's wobble, keeping the climate stable. That's a boon for life. Without it, we could have enormous climate mood swings over billions of years, with different areas getting extraordinarily hot and then plunging into long ice ages.
Trees (and other plants) produce oxygen. Human and animal life need the oxygen for their survival, which trees (and plants) produce. Plants take in CO2 (carbon dioxide), the gas humans and animals exhale, and turn it into O2 or oxygen.
Early human ancestors stopped swinging in trees and started walking on the ground sometime between 4.2 and 3.5 million years ago, according to a new study.
It is proposed that one large tree can provide a day's supply of oxygen for up to four people. Trees also store carbon dioxide in their fibers helping to clean the air and reduce the negative effects that this CO2 could have had on our environment.
“Trees can indeed live indefinitely, but this does not happen,” says co-author Franco Biondi, an ecoclimatologist and tree-ring scientist at the University of Nevada, Reno. “Because eventually an external agent, biotic or abiotic [a living thing or a nonliving one such as a physical condition], ends up killing them.”
Humans cannot drink saline water, but, saline water can be made into freshwater, for which there are many uses. The process is called "desalination", and it is being used more and more around the world to provide people with needed freshwater.
It said scientists put the limit on how many people Earth can feed at 10 billion maximum. The website uses the latest and most accurate live statistics on the state of the planet. As at the time of writing, TheWorldCounts said Earth will run out of food in 27 years and 249 days.
the world's most populous country. Southern China's longest drought on record is the latest manifestation of a slow-burning but increasingly severe water crisis. Left unchecked, it has the potential to act as a material handbrake on China's development. Thus far, southwestern China has borne the brunt of the drought.
The high concentration of oxygen can help to provide enough oxygen for all of the organs in the body. Unfortunately, breathing 100% oxygen for long periods of time can cause changes in the lungs, which are potentially harmful.
At least half of Earth's oxygen comes from the ocean.
The surface layer of the ocean is teeming with photosynthetic plankton. Though they're invisible to the naked eye, they produce more oxygen than the largest redwoods. Scientists estimate that 50-80% of the oxygen production on Earth comes from the ocean.
The ozone layer is made of oxygen. If the world lost its oxygen for five seconds, the earth would be an extremely dangerous place to live in. Due to the severe sunburn, our inner ear would explode. The air pressure on the earth would drop 21 per cent and our ears would not get enough time to settle.
A single mature tree, meanwhile, may take in about 50 pounds of carbon dioxide per year. At this rate, it would take 640 trees per person to account for all American emissions, which adds up to more than 200 billion trees.
A tree needs about 9 m² space to grow, so 22 trees need 200 m² or half an acre. The average net absorption per tree is about 30 kg of CO2 per year, so it will take 22 trees to compensate for the emissions of one year's commute of 20 km per day.