Question

what is carbon dioxide in air but we cannot se oxygen also why?​

Answer 1

Answer:

Carbon dioxide levels are the highest they’ve been in almost three million years. During the past five decades, humans have added enough carbon dioxide to raise the global concentration of carbon dioxide by about 100 ppm and growing. With some climate models predicting CO2 levels to rise to over 900 ppm by then of the century, many people are concerned about the effects of carbon dioxide on the climate

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