The temperature of the Earth is a balance between the energy it gets from the Sun and the energy radiated back to space
Gasses in the atmosphere act as an insulating layer, they absorb most of the energy which would normally be radiated out into space. This causes the temperature of the planet to increase
Green house gasses:
Methane
Carbon dioxide
Water vapour
Global warming is causing climate change
Consequences of global warming:
Thermal expansion
Low-lying land being flooded
Animal habitat might change as temperature increases
Changes in migration patterns
Biodiversity decreasing as species unable to survive and adapt