Earth could be hottest in 420mn years by 23rd century: Study
A UK-based study has suggested that in 200 years, Earth's climate could be warmest since last 420 million years. The research compiled over 1,200 estimates of ancient atmospheric CO2 concentrations dating back nearly half a billion years. It concludes that if humanity burns all available fossil fuels in the future, atmospheric CO2 levels would be highest in the 420-million-year period.