01. There is no single perfect environment for all species of plants. There plants well adapted to each of the environments with the exception of extreme habitats such as total darkness or where the temperatures never go above freezing or very salty areas. There is an ideal environment for each species of plant.

02. There a specific physical factors that plants need to grow and reproduce. Even in extreme habitats, there are plants that can survive as seeds or dormant underground structures (rhizomes, tubers, bulbs) that can start growth when growth conditions improve.

03. Increasing carbon dioxide concentrations can really increase the photosynthetic rate. The downside of increased carbon dioxide concentrations in the atmosphere is increased temperatures which may cause a change in weather patterns that could impact crop production. Increased CO2 in the oceans may increase the photosynthetic rate of algae but at the same time, it causes increased sharpness of the ocean causing a decrease in survival of algae.

04. To maintain the current habitats we need to minimize the production of CO2, regulate the pollution of the air and water, reduce use of pesticides and fertilizers that cause pollution, reduce human impact on the environment.