Is temperature change caused by higher CO2 in the atmosphere or is temperature change caused by higher CO2 in the atmosphere?

The siwss topologic institute creates and publishes accurate maps of switzerland for a long time. The maps are published by swisstopo. It is possible to scroll trough time - therefore it is possible to see how one of the swiss glaciers shrunk.

In the picture above it is possible ot observe, that the «Grosse Aletschgletscher» has been shrinking since 1856 (first available data) with various speeds.