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The current atmospheric carbon dioxide level of 380 ppm is a small fraction of what it was during other periods of earth's history. It peaked at about 7000 ppm 530 million years ago in the Cambrian period. When looking at a graph of carbon dioxide levels and average temperatures, it is plainly visible that there is no correlation (Google "climate and the carboniferous period" to see the chart and article). It is true that the planet is warming, but it appears the cause is that the sun has gotten hotter and this increase in output is cyclical.
Answer:
The vast majority of scientists have concluded that the present rapid global warming is caused by man made greenhouse gas emissions. The primary emission i s carbon dioxide. Man has also altered the greenhouse gas sinks (processes that remove carbon dioxide) so that less carbon dioxide is removed from the air.
- Thy know the earth is heating up from measurements of air land and sea
- They know carbon dioxide and other GHGs are increasing by direct measurement.
- They have observed direct consequences from measurement of permafrost, arctic multivear ice, plant and animal populations and glacier erosion.
What else can I help you with?
How is global warming started?
global warming has started because of population of the o-zone layer are our world and many scientist think that the world might end IN 2012 "population of the o-zone layer" and "many scientist think that the world might end in 2012" Come on what kind of gobbledygook is that? Globan warming and global cooling are natural cycles caused by sunspot activity and other natural factors.
Can Neptune get global warming?
Global warming is not natural, it is caused by people. Since there aren't people on Neptune, it cannot have global warming.
Is global warming considered a natural disaster?
Global warming is not considered a natural disaster itself, but it can contribute to natural disasters such as hurricanes, wildfires, and droughts.
Changes in the cycle are implicated in global warming?
The idea that Global Warming is a natural cycle is well understood from paleo.
What term best describes worldwide temperatures rising above their natural levels?
Global warming
Why is the process of global warming crucial to earth?
The process of global warming, that is the recent warming over the past 200 years since we began to seriously burn fossil fuels (coal, oil and natural gas), is notcrucial to earth. In fact it is extremely dangerous.The greenhouse effect, which has kept the earth warm enough for life for millions of years is crucial to earth. But the greenhouse effect is not the same as global warming.
How do generators contribute to global warming?
Generators contribute to global warming by burning fossil fuels such as coal, oil, and natural gas to produce electricity. This process releases carbon dioxide and other greenhouse gases into the atmosphere, which trap heat and contribute to the warming of the planet.
When was scientist first warned about possible global warming?
early to mid 1900's.
What natural occurrences can you locate to support neomalthusianism?
Global warming
Was Al Gore wrong about global warming?
No. Although Al Gore himself is not a scientist, he has listened carefully to what scientists have to say about global warming. He is concerned about scientific predictions about the potential effects of global warming on society and the world as a whole, because that is what most scientists are telling him.
Does everybody get affected from global warming?
Everybody is affected by global warming. This phenomenon can the water supply, agriculture, the natural environment, and power and transportation systems.
What are the reasons global warming is natural?
To some extent, global warming is a natural event. Carbon dioxide is a naturally occurring greenhouse gas. At normal concentrations, it, along with other greenhouse gases, helps maintain global temperatures at a level that is comfortable for humans and other animals that have adapted to the present climate. Throughout human history until the Industrial Age, atmospheric carbon dioxide levels were in the range 260-280 parts per million (ppm) and never higher than this. This is the natural part of global warming. By adding new carbon dioxide to the atmosphere, which we do by burning fossil fuels such as coal, oil and natural gas, and by cement manufacture, we interfere with the natural process and create enhanced global warming, which is not natural.
