how would the amount of carbon dioxide in the atmosphere change if there were no plants?
492704
it would incease exponentially... plants take in the CO2 and produce oxygen.  We take in oxygen and produce CO2.  without plants, we would die.\n\namaya is wrong by the way
443721
it depends on the species, the soil condition, the amount of sunlight and the temp and wind or lack of.
945520
The Earth's primitive atmosphere was much different from today's and consisted primarily of ammonia, methane, and trace amounts of carbon dioxide and water vapor.  There was little, if any, free oxygen present.
154834
Because trees and plants take in carbon dioxide and put out oxygen.
897410
When a plant (a collection of cells) metabolizes and goes through its respiration, it requires carbon dioxide. It gives off oxygen as a by-product.\n\nWhen an animal (a collection of cells also) metabolizes and goes through respiration, it requires oxygen and gives off carbon dioxide.
1169149
Carbon dioxide is used by the plant to produce glucose in the dark reactions of photosynthesis.  Without carbon dioxide the plants would be rather usless in the food chain.\n\n\nAll answers are correct.  Producers are the source of food for the next trophic level up.  Energy transfer is about 10% from level to level, with the rest going off as heat.  It would be bad news if there were more organisms above the others in the pyramid.  this would help lead to total extinction of life as we know it.
141492
very very very very little\nmostly co2
880801
Well for one, corn is a C4 plant.  Without corn, the world would be very different.  Moreover, a large part of the world is too warm for most C3 plants to thrive in, like the extreme tropics and all deserts.  Without C4 and CAM plants, the amount of vegetation on the Earth would be far sparser.  If this were the case, the oxygen and carbon dioxide levels on Earth would be drastically different, as would our climate.
387735
A couple reasons, really.  First, all food chains begin with the plants that make their own energy from photosynthesis.  Without this step, there would only be a small amount of energy on the Earth, and with no way to replenish it, life would essentially cease to function.\n\nSecond, plants are the biggest converters of carbon dioxide to oxygen.  And trust me, that's kind of important.\n\nThird, nutrition.  Humans are omnivores, meaning they eat both plants and meat.  Without plants, the diet would be missing lots of essential nutrients.  Plus you run out of cows to eat when thay have nothing to graze on.
820753
The vibration is the ingredient that promotes an increase in the growth of the plant.  I believe more carbon dioxide would be supplied to the plant by the vibration and the growth would increase.
823519
If there was no greenery or trees, no plants or any of the other things you mention there would be no life. So mankind would not exist.
550018
There are many.  What follows are just a few, and I am certain many people would put them into different catagories:\n\nDeforestation is one.  Humans have cut down many areas of natural vegetation and either replaced it with crops or built cities on it.  Plants return oxygen to the atmosphere from carbon dioxide; they reflect light and adsorb heat from the sun.  Both plants and the soil help adsorb water and pollutants.  The more of the planet we pave, the fewer trees and less soil exist to regulate these functions.\n\nPollution is another.  We dump our trash on land and in the oceans.  We create chemical compounds that wouldn't exist in nature and spread them in the land, water, soil and air.  Some directly effect the health of living things; others effect things like the ozone layer, taking away natural system that protect life on this planet.  We dump the heat from our indutrial processes into the atmosphere and water.\n\nAnd, now, we're relatively certain we are creating enough waste of carbon dioxide, water vapor, and other gases in our atmosphere to trap excess heat in the atmosphere.  Enough of it to warm the entire globe just fast enough that plants cannot adapt.  Fertile zones will change.  Crops may fail.  Livestock (and wild animals) that depend on plants for forage may die.  Areas that we now comfortably inhabit - with suitable climates and drinking water may become desert.  Others may end up under rising oceans as glaciers melt.\n\nWhat can we do about it?  Everyone will likely have a different answer.  As an American, I have to say I am more guilty than many others who will read this.  The average American family (about 5 people) owns 9 internal combustion (gasoline or diesel) engines; in a still developing nation like China, there is one engine for every 159 people. If the Chinese lived like the American, how much soot, smog, waste heat, and carbon dioxide would be produced on a single summer day of driving, lawn mowing, and boating?  How much could our planet take?\n\nThe answers aren't easy.  In the short term, we can use applicance - from light bulbs to computers - that are more efficient in how they use the energy we make.  We can think about how to reuse things to create less waste; or not use them at all. (Seriously, how much of your groceries really need to be double bagged?  And does your produce really need to go in another bag inside that?) We can decide whether we really need to build a new 3 bedroom house for ourselves, or if an older, smaller place can be refurbished to suit our tastes. \n\nBut, ultimately, we use too much.  We burn too many things to create the energy we use.  Period.  But, what are the alternatives?  Deforest vast tracts of land to crate wind and solar farms?  I will leave you to draw your own conclusions, but it seems more and more like the future of our existence on Earth depends on the right answer.
325682
Because the biomass of a rainforest is not really increasing, it is more at a steady state (or decreasing if you look at the amount of forest getting chopped down). \n\nPlants remove carbon out of the air. If they use it to grow, the carbon stays with the plant and is consequently removed from the atmosphere. If they use it for energy they convert it into carbondioxide again just like we do. In addition there are many decay processes in a rainforest (all releasing carbondioxide which had been fixed in plants). So as long as the mass of the rainforest stays about constant it won't really remove carbon dioxide from the air. \nIt's the same than first growing a field of some plant (which fixes carbon) and then burning (or eating) it (releasing the carbon) on average that's a carbon neutral act. \nIf we would let rainforest regrow on a lot of deforested land, that would remove carbondioxide from the atmosphere while the forest is growing in mass.
804350
Plants don't inhale oxygen, they "inhale" carbon dioxide and release it to make oxygen.
1002178
Carbon dioxide acts as a greenhouse gas at all altitudes. You are correct that it is heavier than air, and therefore is less prevalent at higher altitudes.
447378
in biology, the exchange of carbon between living organisms and the nonliving environment. Inorganic carbon dioxide in the atmosphere is converted by plants into simple carbohydrates, which are then used to produce more complex substances. Animals eat the plants and are then eaten by other animals. When these life forms die, they decay, breaking down into, among many other things, carbon dioxide, which returns to the atmosphere. Plants and animals also release carbon dioxide during respiration. Animals and some microorganisms require the carbon-containing substances from plants in order to produce energy and as a source of materials for many of their own biochemical reactions; this cycle is vital to them. The process of incorporating carbon dioxide into the molecules of living matter is called fixation. Nearly all carbon dioxide fixation is accomplished by means of photosynthesis, in which green plants form carbohydrates from carbon dioxide and water, using the energy of sunlight to drive the chemical reactions involved. Green plants use carbohydrates to build the other organic molecules that make up their cells, such as cellulose, fats, proteins, and nucleic acids. Some of these compounds require the incorporation of nitrogen (see nitrogen cycle). When carbohydrates are oxidized in cells they release the energy stored in their chemical bonds, and some of that energy is also used by the cell to drive other reactions. In the process of oxidation, or respiration, oxygen from the atmosphere (or from water) is combined with portions of the carbohydrate molecule, producing carbon dioxide and water, the compounds from which the carbohydrates were originally formed. However, not all of the carbon atoms incorporated by the plant can be returned to the atmosphere by its own respiration; some remain fixed in the organic materials that make up its cells. When the plant dies, its tissues are consumed by bacteria and other microorganisms, a process called decay. These microorganisms break down the organic molecules of the plant and use them for their own cell-building and energy needs; by their respiration more of the carbon is returned to the atmosphere. The carbon-containing molecules that an animal derives from consuming other organisms are reorganized to build its own cells or oxidized for energy by respiration, releasing carbon dioxide and water. When the animal dies it too is decayed by microorganisms, resulting in the return of more carbon to the atmosphere. Carbon-containing molecules in wood (or other dry, slow-decaying organic materials) may be oxidized by burning, or combustion, also producing carbon dioxide and water. Under conditions prevailing on earth at certain times, green plants have decayed only partially and have been transformed into fossil fuels–coal, peat, and oil. These materials are made of organic compounds formed by the plants; when burned, they too restore carbon dioxide to the atmosphere.
815771
Well plants are organisms that don't breathe in oxygen. They breathe in carbon dioxide.