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Current Affairs

Oceanic debris reveals changes in Earth’s climate

Date: 13 September 2020 Tags: Miscellaneous

Issue

Scientists have discovered how the Earth’s climate has changed over 66 million years by analyzing marine debris.

 

Background

The tilt of the Earth’s axis and the shape of its orbit around the Sun influence these states, each with a clear response to orbital changes.

 

Details

  • According to researchers, the Earth’s climate has been an ice house for the past three million years, with hot and cold seasons.

  • Based on their findings, the team has developed a climate reference curve to show continuous records of the past and how climate has changed since the extinction of dinosaurs.

  • Samples collected from sea level for more than five decades were analyzed by an international research team.

  • Scientists have performed a mathematical analysis to identify four climatic conditions associated with changes in greenhouse gas emissions.

  • During the Paleocene-Eocene Thermal Maximum (PETM) period, about 55 million years ago, rapid global warming caused the climate to become a hot state, which is associated with the release of large amounts of carbon into the atmosphere.

  • During the Eocene, about 34 million years ago, ice sheets began to form in Antarctica as atmospheric carbon dioxide levels declined and the climate changed to a coolhouse state.

  • They say greenhouse gas emissions and other anthropogenic, or human-led activities are leading the planet into warmer, hotter house climates that have not been seen since the Eocene period.