The figures the researchers provided are an estimate based on available energy and cement industry data through the first nine months of the year, and projections based on economic trends and the amount of carbon different countries are believed to be emitting to use energy. The estimated growth could change a bit, Jackson said -- it's possible the final number could be between an increase of 1.8 percent and 3.7 percent. But either way, there's little doubt that 2018 hit a new record high for global emissions.