Measurements at Mauna Loa by the Scripps Institution of Oceanography recorded 415.50ppm carbon dioxide CO2 concentration in the atmosphere for the first time in millions of years. This includes humans who evolved with around 280ppm.
Temperature follows CO2, thus as additional carbon pollution is heating the atmosphere, with about 90% of this extra energy accumulated from global warming absorbed in the Oceans – like a big charging battery, contributing to increased rates of ice melt around the world, ie. the ice sheets in Antarctica, causes Ocean waters to expand – sea level rise, and drives coral bleaching.
Other considerations evolve around direct physical impacts from higher CO2 concentrations in ambient air.