Key findings from the IPCC’s 6th Assessment Report: The Physical Science Basis:
- Concentrations of CO2 in the atmosphere were higher than at any time in at least two million years
- Global surface temperature was 2.F higher in 2011– 2020 than avg. 1850–1900. Most of the warming occurred in the past 40 years, with the seven most recent years being the warmest. The years 2016 and 2020 are tied for the warmest year on record.
- Global temperatures will continue to rise until at least 2050, even if greenhouse gas emissions were to stop today
- Human influence is very likely the main driver of the global retreat of glaciers since the 1990s.
- Glaciers are melting at rates unprecedented in human history.
- The loss of reflective snow/ ice means sunlight penetrates the oceans warming them more.
- In 2011–2020, annual average Arctic sea ice area reached its lowest level since at least 1850.
- More “extreme weather events” (floods, fires, hurricanes) have begun happening even faster than expected. The rate of extreme events in 2020 was initially forecast for the year 2100.
- Droughts have tripled in the last 50 years, fisheries have collapsed due to extreme heat events, and over 20 million people have been displaced due to extreme weather events in the last ten years.
- Global agricultural productivity has actually decreased due to changes in rainfall patterns, increased Temperatures, increase in fungal infestations, and numerous other causes.
- Roughly half the world population is experiencing “water scarcity” for at least one month per year
- Nearly half a billion people are experiencing “unfamiliar precipitation patterns”—droughts in some places, flooding in others.
* The Ocean Is Getting Warmer: The ocean has absorbed much of this increased heat, with the top 100 meters (about 328 feet) of ocean showing warming of more than 0.6 degrees Fahrenheit (0.33 degrees Celsius) since 1969. Earth stores 90% of the extra energy in the ocean.
* The following lists the nearly 200 worldwide (Including American) scientific organizations that hold the position that climate change has been caused by human action.
* How fast is the Climate changing ?
Imagine you are 20 years old, 5 feet 6, and weigh 150 pounds, with a body mass index (BMI) of 24 (healthy).
– If you gain two pounds / year for 50 years, at 70, you’ll weigh 250 lbs; have a BMI of 40 (obese).
-An alternative is that you gain two pounds / week for a year. By the end of the year, you’ll weigh 254 pounds.
These are two different rates of change with drastically different consequences.
For atmospheric CO2, we are on the two pounds per week trajectory.
“Nations around the world would need to immediately stop approving new coal-fired power plants and new oil and gas fieldsand quickly phase out gasoline-powered vehicles if they want to avert the most catastrophic effects of climate change”
The world’s existing fossil-fuel infrastructure would generate another 660 to 850 gigatons of emissions. Vs the 400 GT limit.Meeting the goal will require taking coal, oil, and natural-gas capacity offline before it was designed to shut..
MALIN L. PINSKY AND ALEXA FREDSTON. SCIENCE • 28 Apr 2022
“Accelerating ocean warming and de-oxygenation threaten a mass extinction rivalling the worst in Earth’s history, especially for cold water species, such as the Atlantic rock crab shown here.”The year 2021 marked the highest temperature and likely the lowest oxygen content for the oceans since human records began (1, 2). These changes have put marine species on the front lines of climate change.* Marine species’ geographical ranges are shifting faster and experiencing more contractions than those of terrestrial species.
NOTE: Shellfish Can not migrate !