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In an analysis of the past 1.2 million years, UC Santa Barbara geologist Lorraine Lisiecki discovered a pattern that connects the regular changes of the Earth's orbital cycle to changes in the Earth's climate. The finding is reported in this week's issue of the scientific journal Nature Geoscience.
Lisiecki performed her analysis of climate by examining ocean sediment cores. These cores come from 57 locations around the world. By analyzing sediments, scientists are able to chart the Earth's climate for millions of years in the past. Lisiecki's contribution is the linking of the climate record to the history of the Earth's orbit.
It is known that the Earth's orbit around the sun changes shape every 100,000 years. The orbit becomes either more round or more elliptical at these intervals. The shape of the orbit is known as its "eccentricity." A related aspect is the 41,000-year cycle in the tilt of the Earth's axis.
originally posted by: Lr103
I will agree to the fact(s) that Earth's climate, and atmospheric composition,(mostly Nitrogen) has changed (and will continue to change) periodically over an observable time scale (evidenced through ice core,current understanding of Earths orbital fluctuations relative to our sun, and geological evidence,possibly due to volcanic activity CO2 increase, and CH4 increase data from ice,air, and rock samples) is under way, right now. I will agree that these observable changes may possibly result in a global warming. I do not agree to any statement that this change is in any way anthroprogenic,
, or human caused. However...considering the natural cycle, What if We have put just enough extra CO2 into the atmsphere to tilt the cycle ... ? did we cause it or not?
Seems that she's providing more evidence of the influence of the Milankovitch cycles. It's generally accepted that is what causes glacial and inter-glacial periodicly.
the plants and trees use Co2 to produce oxygen at least thats what ive learned back then in school long time ago,
lants act as a good complement to humanity, as the latter species breathes out carbon dioxide, which the plants then turn it into the oxygen humans need to live. Plants take in carbon dioxide, nutrients from the soil, water, and sunlight and create oxygen and a kind of simple sugar that they use for energy. This is a process necessary to life on Earth.
During this process, the plant combines carbon dioxide with water to allow the plant to extract what it needs for food. The plant uses sunlight as energy to perform this chemical reaction. Photosynthesis separates carbon dioxide and water — known as CO2 and H2O, respectively — into their individual molecules and combines them into new products. Once the process is done, the plant releases Oxygen, or O2, into the surrounding air. It also creates C6H12O6, a substance similar to glucose, that feeds the plant.