[ExI] why worse necessarily?

[BillK]

On Wed, 5 Aug 2026 at 00:42, spike jones via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

> <snip>
>
>  Now, on 4 August, NOAA is saying there is no tropical cyclone activity
> expected in the Atlantic in the next seven days, which takes us out to 11
> August.  If the Atlantic doesn’t get with it right away, we could have two
> record setting years in a row.
>
>
>
> All this leads me to a question I have long had: if climate changes, how
> do we know the change is necessarily for the worse?
>
> spike
> _______________________________________________
>


The latest Qwen 3.8 Max Thinking AI provided a good analysis.
Yes, there are some beneficial changes, like agriculture in the Arctic
regions.
But they are vastly outweighed by changes for the worse to existing
agriculture.
BillK

Question:
If the world climate is changing, how do we know it is getting worse rather
than better, or just a different set of problems?

Qwen 3.8 Max Thinking AI:
The question of whether climate change is getting "worse," "better," or
just "different" is one of the most critical issues in modern science and
policy. To answer it, scientists, economists, and sociologists do not just
look at temperature; they look at the *rate of change*, *systemic stability*,
and the *capacity for adaptation*.
While the Earth’s climate has always changed naturally, the scientific
consensus is that current climate change is getting objectively "worse" for
human civilization and global ecosystems. Here is a breakdown of how
experts reach this conclusion.
1. The Definition of "Worse": The Holocene Baseline
To determine if things are getting worse, we must define a baseline. Human
civilization—including our agriculture, coastal cities, and global supply
chains—developed over the last 10,000 years during a geological epoch
called the *Holocene*. This period was characterized by a remarkably stable
climate.
"Worse" is defined as moving away from the stable conditions that currently
support 8 billion people.

   - *Better:* Conditions that allow for stable food production, manageable
   weather patterns, and the preservation of current coastlines and
   biodiversity.
   - *Worse:* Conditions that increase famine, mass migration, economic
   instability, and the loss of habitable land.

2. The Speed of Change (Velocity)
The primary reason scientists view current change as "worse" than
historical natural cycles is the *velocity* of the warming.

   - *Historical Context:* In the past, natural global warming (such as the
   exit from an Ice Age) took thousands of years. This gave ecosystems time to
   migrate and adapt.
   - *Current Context:* Human-driven greenhouse gas emissions have forced
   similar amounts of warming into a matter of *decades*.
   - *The Consequence:* Ecosystems and human infrastructure cannot adapt
   fast enough. For example, trees and animals cannot migrate to cooler
   latitudes quickly enough to survive, leading to mass extinction events.
   Infrastructure (roads, dams, cities) built for the climate of the 20th
   century is becoming obsolete or dangerous much faster than it can be
   replaced.

3. "Better" vs. "Worse": The Global Balance Sheet
It is true that climate change creates a "different set of problems" and
even some localized benefits. However, the global consensus is that these
are vastly outweighed by systemic harms.
The "Better" (Localized Benefits)

   - *Longer Growing Seasons:* High-latitude regions (like parts of Canada,
   Russia, and Scandinavia) may see longer agricultural seasons and fewer
   winter deaths from cold.
   - *New Trade Routes:* Melting Arctic sea ice opens the Northwest
   Passage, shortening shipping routes.
   - *CO2 Fertilization:* Higher CO2 can initially boost plant growth in
   some areas (though this effect diminishes as heat and water stress
   increase).

The "Worse" (Systemic Risks)
While a farmer in Siberia might benefit, the global food system is
interconnected, and the net impact is negative.

   - *Tropical and Temperate Crop Failure:* Staple crops (wheat, corn,
   rice) are highly sensitive to heat. Warming in already-hot regions (which
   produce the bulk of the world's calories) leads to massive yield drops,
   triggering global food price spikes and famine.
   - *Water Scarcity:* Changes in precipitation patterns and the loss of
   mountain glaciers (which act as water towers for billions of people in Asia
   and South America) threaten drinking water and irrigation for massive
   populations.
   - *Extreme Weather:* The energy in the climate system is increasing,
   leading to more intense hurricanes, heavier rainfall (causing flash
   floods), and prolonged, hotter droughts that fuel mega-fires.
   - *Sea Level Rise:* Unlike the "different problem" of a new shipping
   route, sea-level rise is a strictly "worse" problem. It permanently
   destroys high-value real estate, displaces millions of people (creating
   climate refugees), and causes saltwater intrusion into freshwater aquifers.

4. Phenomena with No "Benefits"
Some aspects of climate change are entirely negative and represent a
degradation of the planetary system:

   - *Ocean Acidification:* The ocean absorbs about 25% of human-emitted
   CO2, changing its chemistry. This makes it difficult for marine life
   (corals, shellfish, plankton) to build shells. Since plankton is the base
   of the marine food web, this threatens the entire ocean ecosystem and the
   fisheries humans rely on. There is no beneficial side to ocean
   acidification.
   - *Wet Bulb Temperatures:* As heat and humidity rise, we approach "wet
   bulb" thresholds where the human body can no longer cool itself by
   sweating. In these conditions, even healthy people resting in the shade can
   die of heatstroke within hours. This makes parts of the tropics and
   subtropics temporarily uninhabitable.

5. Tipping Points and Irreversibility
Scientists are concerned with "worse" because of *tipping points*—thresholds
that, once crossed, lead to irreversible and self-perpetuating changes.

   - *Permafrost Thaw:* As the Arctic warms, permafrost melts, releasing
   methane (a potent greenhouse gas). This causes more warming, which causes
   more melting. We cannot "turn this off" even if we stop human emissions.
   - *Ice Sheet Collapse:* The destabilization of the West Antarctic or
   Greenland ice sheets could raise sea levels by several meters over
   centuries, a change that cannot be undone on human timescales.
   - *Amazon Dieback:* The Amazon rainforest is drying out and may
   transition into a savanna. This would release billions of tons of stored
   carbon and destroy the most biodiverse ecosystem on Earth.

How Scientists Measure the Trajectory
We know it is getting worse through rigorous data collection:

   1. *Attribution Science:* Scientists can now calculate exactly how much
   more likely a specific heatwave or flood was made by human-caused climate
   change. The frequency of "1-in-100-year" events is increasing globally.
   2. *Paleoclimatology:* By studying ice cores and tree rings, we know
   that CO2 levels are higher now than at any point in the last 2 million
   years, and they are rising 100x faster than the fastest natural increase in
   the geological record.
   3. *Observational Evidence:* Satellites, ocean buoys, and weather
   stations track the melting of ice, the rising of seas, and the shifting of
   biomes in real-time, confirming that the most severe climate models are
   coming true.

Summary
We know climate change is getting "worse" because it is destabilizing the
narrow environmental band that allowed human civilization to thrive. While
the planet itself will survive—and eventually evolve new ecosystems over
millions of years—the current trajectory is objectively worsening the
prospects for global economic stability, food security, and human safety in
the coming centuries.
-------------------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.extropy.org/pipermail/extropy-chat/attachments/20260805/8446ad72/attachment.htm>