A new study on climate-tracking satellites suggests our measurements have likely been underestimating the warming of the troposphere (the lowest region of the atmosphere) during the last four decades, which could indicate the global warming that has already happened may be substantially worse than we thought. The study, published in the Journal of Climate, shows the satellite data used by scientists to create climate models doesn't meet the basic physics equations that regulate the relationship between temperature and moisture in the air. This indicates that satellite measurements of the troposphere have either understated or overstated its temperature and moisture, and the data that indicate the least warming might be the least accurate.