"Temperature change" refers to the difference in how hot or cold something is compared to before. It describes the shift or variation in temperature. Full definition
Global rates of temperature change in high and declining greenhouse gas emission scenarios. (climatecentral.org)
Comparing global temperature changes in different models is one way of checking their results. (usask.ca)
In recent decades, a number of groups have tried combining sets of these proxy records together to construct long - term estimates of global temperature change over the last millennium or so. (globalwarmingsolved.com)