Over the past 50 years, the global rate of Oxygen at ocean is decreased by two percent. Scientists identified that burning of fossil fuel increases the greenhouse gas in atmosphere and 40 percent of greenhouse gases gets absorbed by ocean.
NASA shortlisted three main landing site for 2020-Mars-Rover Mission. In its previous mission, NASA's Spirit rover already explored Columbia Hills that is one of the preferred location among those three landing sites. Spirit found Opaline Silica at Columbia hills that indicate there could be several hot springs in ancient Mars.
A new scientific report has stated that oxygen levels have decreased In oceans, specifically Pacific and Arctic. It has largely affected the aquatic organisms.