The impacts of the greenhouse effect can be summarized in the following points:

Global temperature increase
Melting of polar ice caps and glaciers
Rising sea levels
More frequent and intense extreme weather events such as storms, droughts, and heatwaves
Changes in ecosystems and species extinction
Ocean acidification
Health issues due to air pollution and heat stress

Please note that this is just a brief summary of the impacts of the greenhouse effect. There are many more aspects that can be considered.