The atmosphere and oceans have warmed, the amount of snow and ice has diminished, sea levels have risen, and the concentration of carbon dioxide has increased.
However, they were different during the transition to the last ice age- approximately 80,000 years ago, temperature declined while the carbon dioxide content of the atmosphere remained relatively stable.
The Siberian taiga is the world's largest terrestrial ecosystem, and it is believed that its respiration and photosynthesis have a great impact on the fluctuation of CO2 concentrations.
In the past, the carbon dioxide concentration on the earth has repeatedly risen and fallen in the range of 170-300 ppm with a cycle of about 100,000 years, but the level surpassed 315 ppm in 1958 and only 57 years later, in 2015, exceeded 400 ppm.
The warming is good for living things During the Mesozoic era, about 245-65 million years ago, when dinosaurs were striding, the carbon dioxide density was ten times as high as that of today and temperature was about ten centigrade higher than today but the earth those days was a paradise for a life.
During the Mesozoic era, about 245-65 million years ago, when dinosaurs were striding, the carbon dioxide density was ten times as high as that of today and temperature was about ten centigrade higher than today but the earth those days was a paradise for a life.
Professor Richard Betts of the Met Office Hadley Centre and the University of Exeter said:“Since 1958, monitoring at the Mauna Loa observatory in Hawaii has registered around a 30 per cent increase in the concentration of carbon-dioxidein the atmosphere.
Daniel Lunt and colleagues combine a global climate model with a reconstruction of the Earth's environment three to five million years ago, when temperatures were 3 to 5°C warmer than today. They use the model to separate various contributions to global temperatures, and find that atmospheric carbon dioxide concentrations caused more warming than would be expected from the estimates of climate sensitivity that are used for future climate projections.
現在の大気中の二酸化炭素濃度は390ppmとなっていますが。
We are, right now, at 390 parts per million of CO2 in the atmosphere.
大気中の二酸化炭素濃度は、300万年ぶりの高水準に達しています。
Atmospheric carbon dioxide has reached its highest level in three million years.
現在、確実に二酸化炭素濃度は毎年2〜3ppmずつ上昇している。
At present, atmospheric CO2 is increasing by 2-3 ppm each year.
近年、大気中の二酸化炭素濃度は、一年間に約2ppm増加している。
The level of CO2 in the atmosphere is rising by about 2ppm per annum.
今日の二酸化炭素濃度は、46億年の地球史の中で、最も低い状態です。
The level of carbon dioxide in our atmosphere today is the lowest in Earth's history of 4.5 billion years.
現在、大気中の二酸化炭素濃度は過去数十万年のどの時期よりも高い。
The current amount of carbon in the atmosphere is higher than at any point in the past 100,000 years.
私が小学生のころ、大気中の二酸化炭素濃度は0.03%と習いました。
When I was at school in the 50s we were taught that the amount of CO2 in the atmosphere was 0.03%.
現在の地球の大気中の二酸化炭素濃度は、過去80万年で最も高い数値となっています。
The concentration of carbon dioxide in the atmosphere is now the highest it has been in the past 800,000 years.
現在の二酸化炭素濃度は、過去65万年間の記録にあるどの点よりも、ずば抜けて高い」。
Current levels of carbon dioxide are higher than at any time in the past 650,000 years.
現在の地球の大気中の二酸化炭素濃度は、過去80万年で最も高い数値となっています。
The levels of carbon dioxide in Earth's atmosphere are now the highest they have been in at least 800,000 years.
とりあえず、二酸化炭素濃度は、数十億年にわたる大きな傾向として、減少し続けているということです。
In general CO2 levels have been declining for billions of years.
これを当てはめると、2016年の年平均二酸化炭素濃度は404.45±0.53ppmになります。
This, in turn, gave us a forecast of the average CO2 concentration in 2016 of 404.45± 0.53 ppm.
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