Climate change is a long-term change in weather patterns.
Different example of global climates are the Milankovitch cycles, ocean currents, and volcanoes.
How geologists find out about past climates is through air bubbles trapped inside ice cores determine what the atmosphere was like.
Milankovitch cycles make a slight shift in earths orbit that effect how much sunlight earth gets and changes the climate depending on the shift.
Volcanoes eruptions can cause the toxic gases and ash to prevent sunlight from reaching earth. Other effects are poisoned creatures, poisoned food supply, and air pollution.
Ocean currents can cause earths climate to change because depending on the temperature of the water that's coming.
