elevated co2 concentration

Concentration of CO2 in the Earth's atmosphere hits 415ppm: highest since humanity appeared
The concentration of CO2 on Earth has reached 415 parts per million (ppm) - the highest level since humanity appeared on this planet.
Increased CO2 levels threaten princess butterflies
New studies show that increasing levels of CO2 are reducing the therapeutic effect of earring plants on princess butterflies.
Concentration of CO2 in Earth's atmosphere reaches a record high
The concentration of greenhouse gases carbon dioxide (CO2) on Earth has just exceeded 410 ppm for the first time in human history.
The amount of CO2 will reach a record in the future
According to climate change experts, CO2 emissions will reach record levels if temperatures and sea levels continue to rise.
The concentration of CO2 in the atmosphere has exceeded the new threshold
On May 26, the World Meteorological Agency (WMO) announced that the concentration of CO2 in the atmosphere has exceeded the new threshold.