Albedo

If surfaces are darker, they reflect more sunlight, so more is reflected making it warmer.

If surfaces are darker, they reflect less sunlight, so more heat leave Earth, making it cooler

If surfaces are lighter, they reflect less sunlight, so more heat stays on Earth, making it warmer.

If surfaces are darker, they reflect less sunlight, so more heat stays on Earth, making it warmer.

Deforestation will reduce the number of trees acting as carbon sinks.

Sediments contain frozen methane gas. When the permafrost melts, the methane is released. Methane is a greenhouse gas, so this would increase Earth’s warming.

 When the ice melts, the water beneath is a darker color. This absorbs more heat than the ice. More heat is absorbed, melting more ice.

As with sea ice and the darker water underneath, the land under a glacier is darker than the ice. When the temperature rises and the ice melts, that land is exposed. Since it is darker than the ice, it absorbs more heat, further increasing the temperature.