A study on sea sponges suggests that global warming has already been exceeded. The results are based on 300 years of paleotemperature records preserved in sclerosponges.
However, many experts call for results to be interpreted with caution, given the novelty of the method. It is impossible to compare it with the work of other scientists, says Andrew Hammond, director of the Centre for the Study of Climate Change at the University of Puerto Rico-Mayagüez. The study was published in the journal Nature Climate Change.