There’s been a definite change in the climate since the 1880s. The surface temperature of Earth has risen by about 1.5 degrees Celsius. Temperatures vary over the course of a day as the sun rises; Over each year, as our planet’s tilt angles north and south hemispheres away from the Sun’s rays; And over decades as the Sun itself cycles through changes. Also, not all places on Earth change equally – the poles, for example have shifted a lot. But, with all factors are accounted for, when scientists compare each year's mean temperature to the historical average temperature, they see the clear warming trend. For Our Amazing Planet, I’m Dave Brody