Briefly explain ways cars may become more energy efficient in the future

Where people believe that public transport is better than cars because it is better suited for more people, its cheaper, less pollution and more energy efficient. On the other hand some people have this perspective that cars may become more energy efficient in future containing diesel engines, will be hybrid, fully electric and plug-in electric.

Carbon dioxide and oxygen are differentially exchanged between the atmosphere and the oceans in the carbon cycle. An increase in atmospheric carbon dioxide also raises the carbon dioxide absorbed by the oceans. This increases the pH of the ocean waters which consequently affects the growth of phytoplankton. Low pH affects negatively the growth of phytoplankton. The clarity of the waters would, therefore, increase with pH due to low plankton growth.