Pumpkin puree, most frequently used to make pumpkin pies during the holidays, can also serve as an egg substitute in baked goods. It works especially well in dense, moist items, such as sweet breads and muffins. Trade 1/4 cup of pumpkin puree for each egg in the recipe.
Our Earth is also considered as an ecosystem on a much larger scale. When we introduce external factors such as too much carbon dioxide or methane, it destroys the balance of the ecosystem which in turn affects those who live in it. The result is global warming, water shortage, extinction of species, etc. These impacts every living thing on the planet, which includes us.
Human impacts. Most of the main causes of extinction are caused directly or indirectly by humans. Humans negatively impact the environment for controlling and artificially causing fires, shifting agriculture cultivation with unsustainable techniques, grazing by domesticated animals, overkilling species (Pleistocene overkill), etc.