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What are three theories scientists have proposed to explain natural climate changes?
Although most scientists concur current climate change is primarily driven by human activity, all climate change preceding our industrial revolution was the result of "natural" forces.
The primary natural cause is known as a Milankovitch Cycle, which is a variation in orbital inclination (axial tilt) resultling in a series of ice ages on a one hundred thousand year cycle.
A second cause would be a change in greenhouse gas concentrations, such as an abundance of CO2 emitted by volcanoes over an extended period of time. At present humans emit more than 100 times the carbon dioxide of all earth's volcanoes combined, but it is possible (and theorized) that volcanic activity millions of years ago increased earth's CO2 content.
A third cause would be a drop in CO2 levels, permitting more heat to escape the atmosphere. This occurred about 50 million years ago, when a freshwater arctic fern, Azolla, proliferated over the polar ocean surface. When it died, it sank, sequestering the carbon it had pulled from the atmosphere onto the ocean floor. Over a fairly brief period (geologially speaking) of perhaps a hundred thousand years, earth's CO2 declined enough to result in the first of a series of ice ages, which had not happened for millions of years preceding the "Azolla Event."
Another proposed cause might be a change in cosmic radiation, creating more radioactive isotopes of carbon out of nitrogen. This would increase atmospheric CO2 levels, though we would expect mutation rates among plants and animals to soar also.
Similar to the third theory, any substantial change in biomass (an increase or decrease in plant life) would impact atmospheric CO2 levels, resulting in a change to climate. Local climate can be impacted simply by changes in vegetation. Grazing animals that eat saplings prevent forest cover from maturing. Eventually dark forest foliage gives way to grasslands or lighter covered desert, and this impacts precipitation, resulting in a long term change in local climate.
What else can I help you with?
What are 2 types of global changes concerning scientists?
Global warming and climate chang
How do scientists calculate future climate changes predictions?
Scientists use complex computer models known as climate models to calculate future climate change predictions. These climate models simulate the Earth's climate system by incorporating data on greenhouse gas emissions, land use changes, and other factors that influence climate. By running these models with different scenarios and assumptions, scientists can predict how these changes will affect global temperature, precipitation patterns, sea level rise, and other climate variables in the future.
How do we know that climate change killed the dinosaurs?
Climate change is among the theories proposed to explain the extinction of the dinosaurs. Evidence includes fluctuations in global temperatures, changes in ocean chemistry, and the release of greenhouse gases. Fossil records also show a rapid decline in biodiversity around the time of the dinosaur extinction event.
How have astronomical conditions contributed to global climate changes?
They haven't. Scientists agree that global climate change is caused by human burning of fossil fuels and deforestation.
What tools do you use to to predict future climate changes?
You could use a sling psychrometer to get the relative humidity and predict tomarrows weather. You could use satilites to see what to atmosphere looks like and predict tomarrows weather.
What does a climate does?
A climate scientist studies the data and experiments of other scientists. They do experiments to confirm or reject the results of others' work. This is called peer-review. The produce theories to explain changes in the climate and perform experiments and computer modelling to see if they can prove their theories correct.
What are 2 types of global changes concerning scientists?
Global warming and climate chang
How do scientists calculate future climate changes predictions?
Scientists use complex computer models known as climate models to calculate future climate change predictions. These climate models simulate the Earth's climate system by incorporating data on greenhouse gas emissions, land use changes, and other factors that influence climate. By running these models with different scenarios and assumptions, scientists can predict how these changes will affect global temperature, precipitation patterns, sea level rise, and other climate variables in the future.
What different theories might explain the climate changes thet wiped out the vikings in Greenland and caused the thames river in England to freeze over could humans have caused those climate changes?
=) gd luck
Why do scientists think there are s few redwood species alive today?
Scientists believe that changes in the Earth's climate cause extinction of trees;P
Why did mammoths become exstinct?
Scientists do not know for certain why mammoths died out. Theories include climate change leading to habitat loss or overhunting from humans.
How do we know that climate change killed the dinosaurs?
Climate change is among the theories proposed to explain the extinction of the dinosaurs. Evidence includes fluctuations in global temperatures, changes in ocean chemistry, and the release of greenhouse gases. Fossil records also show a rapid decline in biodiversity around the time of the dinosaur extinction event.
How have astronomical conditions contributed to global climate changes?
They haven't. Scientists agree that global climate change is caused by human burning of fossil fuels and deforestation.
What type of scientists studies weather and climate?
A meteorologist.
How do scientist predict climate?
The scientists observe the changes in climate very carefully. They know that the daily changes in climate are caused by storms and fair weather moving over the Earth . They know that the seasoning changes are due to the turning of Earth around the sun.The most important cause of climate is the heating and cooling of the air.
Do scientists make up the earth's changing climate?
No, scientists neither create the climate, nor imagine the changes occurring within it. Instead, they measure the change.Some climate scientists are financially or politically motivated (generally by the fossil fuel industry) to find no correlation between human activity and climate change. Most scientists, however, lack any financial incentive to find one way or the other. Claims climate scientists not funded by the fossil fuel industry are financially invested in the outcomes of their research are simply false. In fact, climate scientists have an incentive to overturn the current findings. This is how scientists win fame and acclaim--NOT by upholding established findings.
What are climate clues?
Climate clues are evidence or indicators that help scientists understand historical changes in the Earth's climate. These clues can include ice cores, tree rings, sediment layers, and temperature records which provide information about past climate conditions and trends. By studying these clues, scientists can reconstruct past climates and predict future climate patterns.
