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What are the levels of carbon dioxide from past to present?
During the past 500,000 years, levels of carbon dioxide in the atmosphere never rose above 300 ppm (parts per million) or 0.03%. Since the Industrial Revolution, 200 years ago, when we began burning coal, levels have risen to their present (2013) levels of 400 ppm (parts per million) or 0.04%.
How humans change the atmosphere of the planet in the past 200 years?
They have increased the levels of greenhouse gases.
What is the most important thing that has happened in the past 100 years?
the mexican's revolution and in the past 200 years the independence of Mexico
How many eruptions has montserrat undergone in the past 200 years?
7,013
Can a tsunami hit Georgia?
Yes. They can but it is very rare. They have hit in the past ( 200 years or so)
What are the levels of carbon dioxide from past to present?
During the past 500,000 years, levels of carbon dioxide in the atmosphere never rose above 300 ppm (parts per million) or 0.03%. Since the Industrial Revolution, 200 years ago, when we began burning coal, levels have risen to their present (2013) levels of 400 ppm (parts per million) or 0.04%.
How humans change the atmosphere of the planet in the past 200 years?
They have increased the levels of greenhouse gases.
How have humans changed the atmosphere of the plants in the past 200 years?
They have increased the levels of the greenhouse gases.(Apex)
How have humans changed the atmosphere of the planted in the past 200 years?
They have increased the levels of the greenhouse gases.(Apex)
Over the past 200 years the level of carbon dioxide has what?
The levels have risen from 0.028% to the present (2013) 0.04%. This increase has occurred because humans discovered fossil fuels (coal, oil and natural gas) and started burning them. They also committed deforestation! See the simple graphs at the link below.
Has the earth warmed or cooled in the last 50 million years?
The earth has warmed in the past 50 million years. It has had various Ice Ages and temperatures have risen and fallen in the past, but it has never had the rapid rise in temperature that we are now experiencing since the Industrial Revolution, 200 years ago, global warming.
How many mammals have been extinct in the past 200 years in Australia?
17 animals have been etinct in the past 200 years
What is the most important thing that has happened in the past 100 years?
the mexican's revolution and in the past 200 years the independence of Mexico
What year were rifles made?
at least the past 200 years
How many plants have you lost in the past 200 years?
62900471853
How many eruptions has montserrat undergone in the past 200 years?
7,013
What do you call changes in the Constitution that have occurred in the past 200 years?
Amendments
