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The level carbon dioxide (CO2) the atmosphere is now a record high. An American weather station Hawaii recorded the new high the 9th of May. It found CO2 levels were 400 parts per million (ppm). The last time CO2 was this level was five million years ago. This was when there were no humans the Earth. Scientists say the 400ppm level is a warning sign. They say we must do more to stop this number getting bigger. However, scientist James Butler said he thought CO2 levels would keep rising. He warned: " eight to nine years, we will probably have seen the last CO2 reading 400ppm.” He told reporters that even the South Pole, CO2 would be 400ppm.

Carbon dioxide is one the gases that create global warming. Just one CO2 molecule can stay the atmosphere hundreds years. Pieter Tans, one of the scientists measuring CO2 levels, said human activity is making the Earth warmer. He said that, "the burning coal, oil, and natural gas is driving the acceleration". He pointed that 300 years ago, CO2 levels were around 280ppm. He added that 800,000 years ago, they were 180ppm. Another scientist, Dr Ralph Keeling, warned that CO2 is warming the Earth to dangerous levels. He is worried about arctic ice melting, causing sea levels to rise. This will put billions people in danger. He said: “It takes a long time to melt ice, but we’re doing it. It’s scary.”