- Dangers, and
** Evidence for Climate Change
Here you can see some measurements, or carefully constructed estimates based on measurements, of how critical things like sea level have changed in the past.
These measurements show how show how our climate is changing.
It is evidence from organisations that deserve respect, like NASA the US National Aeronautics and Space Administration. They landed a man on the moon in 1969, so they know a lot about the real world.
Sea Level Rise
Let’s start by looking at some past measurements of sea levels, a measure which NASA asserts is highly relevant:
“Sea level rise is THE yardstick for global warming”. (NASA)
Here is some of their data on sea level rise:
The blue line shows how the sea level has risen since 1993. It has risen an average of 3.16 millimetres a year. Some claim that global warming has paused, but this sea level data shows no evidence of that. (Read More …)
See below for data on other key indicators of climate change.
** Dangers of Climate Change:
The main danger of the current global warming is that:
- the current warming is causing more warming,
- which will cause further warming,
- which will cause further warming and so on,
- forming an uncontrollable vicious cycle of escalating temperature. (Read More on Amplifying Feedback …)
** Safe Climate News
Musical Protests against Inaction on Climate: June 2016
See “Warm is Not Cool” Stephen Taberner
To scan the news items, click on “News” in the above menu.
Apologies, the news has not been updated for a while
** Considering solar panels: Do they stack up financially?
Click here to see a way of checking whether solar panels are a good investment for your home, and to for a free spreadsheet to do the sums.
** Solutions to Climate Change
Australia can grasp a secure, prosperous future by rapidly swinging to renewable energy and so adding far less to the carbon dioxide in the atmosphere. The organisation “Beyond Zero Emissions” has developed detailed plans for this transition.
Australia and other countries need to act on these sorts of plans. Australia could:
- Generate all electricity from renewables. Renewables can generate electricity 24 hours a day. For example, the Nevada solar plant shown below. It collects and stores heat to generate electricity day and night. Australia will not need coal, gas or nuclear power. (Read More …)
- Use renewable electricity to power a high-speed rail service on the Australian east coast. (Read More …)
- Modify land use, forestry and agriculture to cut emissions. (Read More …)
- Modify buildings to cut energy use. (Read More …)
** Evidence for Climate Change: The key indicators
Sea Level Rise
Sea Level rise is discussed at the top of this page.
Carbon Dioxide Concentration in the Air
The orange line shows how the “concentration of carbon dioxide in the air” has moved over the last 400,000 years. For the 400,000 years before about 1930, the level only moved between 180 ppm and 300 ppm. Since 1930, the level has soared to above 400 ppm – and is increasing by about 2 ppm each year. (Read More ..)
Average Global Temperature
This shows how the “average global temperature” has risen between 1880 and 2015. Temperatures have risen by 0.67 degrees Centigrade per century since 1880. The hottest years shown on this record were the last two: 2014 and 2015. Note, 2016 was hotter again and 2017 was a very hot year. (Read More ..)
Arctic Sea Ice Area
The blue line shows how the “average area of Arctic ice in September” has dropped over time. The average area of sea-ice has declined by 13.7 percent per decade. (Read More ..)
Antarctica Mass Variation
The purple line shows how the “mass of ice over Antarctica” has dropped between 2002 and 2013. Antarctica has lost 147,000 million tons of ice per year – and this water is contributing to sea level rises. (Read More ..)
Greenland Mass Variation
The purple line shows how the “mass of ice over Greenland” has dropped since 2002. Greenland has lost 258,000 million tonnes of ice a year since 2003. (Read More ..)
The Acidity of our Oceans
The Acidity of our oceans is rising as carbon dioxide in the atmosphere increases. (Read More ..)
** Conclusions of Climate Science
The above key indicators of climate change are part of the evidence for concluding, beyond reasonable doubt, that:
- Our planet is warming
- Our climate is changing
- Human emissions are the cause
- The critical emission is carbon dioxide from burning fossil fuels
Scientists no longer debate whether human emissions are behind global warming. (Read More: Convergence as The Basis for Scientific Confidence.)
The American Association for the Advancement of Science came as close as such a respectable institution can to screaming an alarm in March 2014. “As scientists, it is not our role to tell people what they should do … but human-caused climate change [is threatening] abrupt, unpredictable and potentially irreversible changes.” … The most distinguished scientists from the country with the world’s pre-eminent educational institutions were trying to shake humanity out of its complacency.
(Climate Change Deniers have Won: The Guardian: 22 March 2014)
Powerful lobby groups are campaigning to mislead the public and deny well-established scientific knowledge.
(The Merchants of Doubt: How a Handful of Scientists Obscured the Truth on Issues from Tobacco Smoke to Global Warming: Oreskes & Conway)
** Climate Restoration
For the 650,000 years before about 1930, carbon dioxide levels stayed between 180 and 300 ppm. So we know the planet can keep a human-friendly climate while levels are in this range. However, now levels are above 400 ppm. While levels remain above about 320 ppm, the planet will continue to accumulate heat and temperatures will keep on increasing. We could easily destroy our human-friendly climate.
The only solution that we can adopt with any confidence is to move our climate back to a state in which it has already demonstrated stability. We need to reinstate the conditions similar to those in about 1930, as suggested by the above indicators of climate change, that is:
- Cut carbon dioxide in the air from above 400 ppm to below 300 ppm. One way to do this is to cut emissions by slashing the burning of fossil fuels. Another is to increase the drawdown of carbon dioxide from the air and storing it by expanding forests
- Cool the planet by 0.6 C from the 2014 average global temperature
- Restore the lost ice in the Arctic, Antarctic and Greenland,
- Decrease ocean levels and ocean acidity
We need to act with wartime urgency. This is to reduce the chances of the current warming tipping the climate into an irreversible warming spiral. (Read More …)
Science is clear about how to tackle climate change. And, as identified above, we have detailed plans for moving to a zero emissions economy.
The Benefits of a Zero Emissions Economy
- Reduce the impacts and risks of climate change
- Health and environmental benefits of clean air
- Jobs and knowledge in industries that can prosper long into the future.
Searching this Site
To search all the pages of this site:
- Click on the search icon
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My Policy on Comments
I welcome constructive comments about this site. You can send me your comments via email or by writing comments at the foot of a relevant page.
As quite a few comments are spam, I now only publish comments that mention something about climate change.
Last Modified: 4 Feb 2018