The sun could be having a 15% or 20% effect on climate change

Global warming is mainly caused by greenhouse gas emissions resulting from human activities; however, current climatic variations may be affected “around 15% or 20%” by solar activity, according to the researcher Manuel Vázquez from the Canary Islands’ Astrophysics Institute (IAC) at the Sun and Climate Change conference, organised as part of the El Escorial summer courses by Madrid's Complutense University.