evidence: NOAA does not fraudulently adjust data to create the illusion of a global warming trend Scientists routinely adjust temperature data to correct errors due to weather stations being moved to different locations or instruments being changed.. Historical changes to U.S. stations have caused the number of upward and downward temperature adjustments to be unequal, but this is not representative of the entire world. Overall, adjustments to temperature data reduce the apparent amount of long-term global warming—the opposite of exaggerating it. [...] We know that NOAA’s adjustments improve things since they’re tested and updated whenever issues are found. For example, even a blogger who’s hostile to climate science results published a paper confirming that the NOAA U.S. average temperature changes are solid2. Another study by an independent "red team", partly funded by a Koch foundation, supported NOAA’s conclusions3.