But we know that since an ecosystem is a combination of all these features, the Earth as a big ecosystem is affected in many different ways by any single change.
Atmospheric changes cause changes in vegetation.
An increase in aerosols, from volcanic eruptions or particles from industry, can cause more condensation of water droplets and more rain, or can create more clouds, cooling the Earth's surface. In either case, it would mean a change in the plant life below. If the global temperature rises, the resultant warming causes changes in all the Earth's water regimes. The melting of polar ice and the warmer air temperature both contribute to a rising sea level, which affects all coastal ecosystems as the tide comes farther inland and coastal storm flooding increases. The increased rainfall would make the ocean less salty and cause rises in rivers and water tables, altering the hydrology of many areas.