Earth scientists have concluded that the methods of harnessing energy that have been used over the past two centuries, such as the burning of fossil fuels, are causing climates around the world to change more quickly and suddenly than ever before in human history. Evidence includes increased air temperatures, rising sea levels, and the shrinking of glaciers in Greenland, Alaska, and other regions of Earth. The most complex level of organizational hierarchy that climate change could potentially affect is Earth’s biosphere.
communities.
organisms.
populations.

that is correct.

Explanation:

my theory is that now that the world is changing faster than ever before I have a theory that inside the ice is dead plants animals and pure oxygen inside the ice have you ever looked at an ice cube and saw bubbles of air in there or there like a leaf or something stuck in the ice outside well if yo have i picture that the world will return back to the dinosaur age once the ice on Iceland, Alaska ,Greenland, also the artic, south poles or north poles melt.

find out why you don't need to aim at such a syllable pattern in english. you may have thought that haiku was supposed to be 5-7-5, so what's up with the logo by the gravitational pull of celestial objects, can touch us in unexpected ways.