CO2 is at the highest levels ever experienced in human history
Pixabay / NASA Public Domain
We
are in an unprecedented era, at no point in human history has carbon
dioxide levels been this high, presenting concerning questions over what
lies ahead.
This week the World Meteorological Organization published their yearly report on the “State of Greenhouse Gases in the Atmosphere,” compiling data up to 2018.
The
report, unsurprisingly, found that carbon dioxide reached an all-time
high in 2018 since pre-industrial amounts. The highest recorded
measurement in 2018 was 415.70 ppm on May 15, 2019, higher than it has ever been during human history. Yale’s Environment 360
reports that “based on current emissions, scientists estimate CO2
levels could hit 500 ppm in as little as 30 years,” well within many
people’s lifetime.
Wasn’t CO2 higher in Earth’s History?
Earth has experienced carbon dioxide levels much higher than
current levels, which was discovered by the same climate scientists who
now warn of the dangers associated with current greenhouse gas
emissions.
The Keeling Curve with the latest CO2 levels.
https://scripps.ucsd.edu/programs/keelingcurve/
Carbon dioxide has been as high as 4,000 ppm during the Cambrian, about 500 million years ago and as low as 180 ppm in the Quaternary glaciation (the most recent “ice age” on Earth).
So, why are scientists concerned with the current levels of CO2?
Miami sits just 6.5 feet above sea level.
Education Images/Universal Images Group via Getty ImagesIf Earth has seen an order of magnitude higher carbon dioxide levels than present, why are we to worry?
Generally
speaking, there are two reasons why humans should be concerned over the
recent unprecedented rise in carbon dioxide levels.
We’ve seen CO2 levels rise faster in the past century than ever before in natural history. The annual increase in CO2 levels is increasing about 100 times faster than recorded during natural increases in Earth’s history.
Humans
have largely built our world around Earth’s current climate state and a
widespread change in climate will inevitably lead to hardship, economic
loss, and death.
Uncharted territory makes people nervous
Louis Sass, a physical scientist with the United States Geological Survey, uses a tape to measure ... [+]
Getty ImagesImagine
you’re driving west across the country with no map, no GPS, no
smartphone and in the middle of the night. Humans are at their best when
we’re able to predict the outcomes of our actions, however, the current
rate of CO2 rise leaves scientists worried as there is no blueprint or
map of where we’re headed in the coming decades. We are “driving blind”
into an unknown climate future.
Geologists and climate scientists
can look at ice cores, tree rings, ocean sediment, etc. to reconstruct
what our climate looked like in the past. However, there are no records of CO2 rising at the current rate,
meaning that while we generally know we’re driving west (in the above
analogy), we have no idea what we will encounter on our way.
“We
suggest that such a ‘no-analogue’ state represents a fundamental
challenge in constraining future climate projections,” says Richard E.
Zeebe from the University of Hawaii at Manoa in a Nature paper.
What happens when an environment changes around a static human environment?
Houseboats sit in the drought lowered waters of Oroville Lake, near Oroville, Calif.
ASSOCIATED PRESSThe
other key concern is that humans have built our world expecting a
largely static environment. Our infrastructure, agriculture, areas of
concentrated populations, and energy systems are all built to serve
humans in a relatively static environment.
What do we
do when an entire geographic region sees decades-long drought where rain
was once present? Do those people migrate to new areas, do cities
shrink, do we engineer our environment to redirect water? Well, it’s already happening.
What
do we do when cities become increasingly inundated with ocean water
from rising sea levels? As tides and storms increasingly flood coastal
cities do we build walls or do we abandon infrastructure near the coast
and build more inland? Well, it’s already happening.
What
do we do when mosquitoes migrate farther north then they have ever been
able to live? How does that change epidemiology and the spread of
diseases throughout the world? Well, it’s already happening.
There are countless examples where climate change can throw a wrench in how we operate our daily lives.
That
is why scientists are concerned and increasingly sounding the alarm for
where we are currently headed. Reducing carbon dioxide emissions can
slow and halt these changes, but it’s yet to be seen how quickly humans
will proactively change in the face of a looming climate crisis.
Wrong Again: 50 Years of Failed Eco-pocalyptic Predictions Myron Ebell , Steven J. Milloy • September 18, 2019 Thanks go to Tony Heller, who first collected many of these news clips and posted them on RealClimateScience . SUMMARY Modern doomsayers have been predicting climate and environmental disaster since the 1960s. They continue to do so today. None of the apocalyptic predictions with due dates as of today have come true. What follows is a collection of notably wild predictions from notable people in government and science. More than merely spotlighting the failed predictions, this collection shows that the makers of failed apocalyptic predictions often are individuals holding respected positions in government and science. While such predictions have been and continue to be enthusiastically reported by a media eager for sensational headlines, the failures are typically not revisited. 1967: ‘Dire famine by 1975...
Giant 'Rivers' That Flow Through The Sky Mapped For First Time Environment 26 February 2024 By Tessa Koumoundouros Atmospheric rivers, filaments of intense moisture transport in the atmosphere, can now be automatically detected in satellite observations. (NOAA) Rivers of intense moisture wend their way through our atmosphere just as their liquid counterparts do across the land. Unfortunately the sky streams are much harder for us to see. Often a product of cyclones, atmospheric rivers can dictate where intense rain will fall , making their lack of visibility a problem. Understanding them grows increasingly important as our warming atmosphere soaks up even greater amounts of water, forcing these aerial waterways to change course . Until now, researchers relied on computer modeling to predict where this water vapor likely flows, but researchers have now devised a way for us to spy on them in real time. The missing piece of the puzzle was a 3D windscape....
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