It is generally agreed that 350 ppm is a safe level of CO2 in the atmosphere. Current efforts try to limit the level of CO2 by the end of the century at 450 ppm.
- 1958: 317 ppm
- 2014: 400 ppm
And: The concentrations of CO2 in the atmosphere are increasing at an
CO2 emissions in Austria
- It is not (just) China: in Austria the traffic related CO2 emissions went up by 60% between 1990 and 2010!
" Im Vergleich zu 2009 stiegen die CO2-Emissionen 2010 sogar um 4,9
Millionen auf 84,6 Millionen Tonnen."
" Österreich wird um 75 Mio Tonnen CO2 über dem Kyoto Ziel 2008 bis 2012
liegen, wie die aktuelle Treibhausgas-Inventur 2010 des Umweltbundesamts
zeigt. Für diese Menge wird die Republik rund 600 Millionen Euro an
Strafzahlungen leisten müssen, wie Umweltminister Berlakovich bei der
Präsentation der Treibhausgas-Inventur am 11. Jänner 2012 einräumte."
One of the results: 2012 has seen the lowest ice cover ever observed in the arctic. Compared to the average ice cover between 1979 and 2000, more than 2 million km^2 of ice have disappeared.
- 1.7 billion people rely directly on fossil aquifiers (i.e. groundwater that is
not replenished), and each and every one of these aquifiers is facing a looming
water crisis. For example, not a single drop of the mighty Colorado River
reaches the Pacific any more, because everything is used up in its course.
- Last year, Upper Austria lost >20'000'000 EUR, because of lower than usual
water levels in the rivers.
- Already, nuclear power plants had to be shut down because of lack of
cooling water (Millstone, USA)
- Newfoundland's offshore cod stocks are at one per cent of what they were in 1977.
- British fish stocks have dropped by 94 percent in the past 118 years and commercial fishing has profoundly changed seabed ecosystems, leading to a collapse in numbers of many species.
- Most of the world's major fishery species have been reduced in numbers by
75 to 95 percent or more ("The Ocean of Life", p50).
- Two thirds of the species we have fished since the 1950s have experineced
collapse, and the rate is accelerating (FAO).
- Tuna: 1940 - 300'000t; now: 4'000'000t
Five of the world’s eight tuna species are already classified as threatened or nearly threatened with extinction, according to the Red List of Threatened Species compiled by the International Union for Conservation of Nature (IUCN).
- Humankind now farms 38 percent of the earth's ice-free land. Crops take up
one third of that area; pastures and rangelands for livestock cover the
rest. Little room exists for expansion because most of the remaining land
is deserts, mountains, tundra or urban.
- For every degree of global warming, most crops (wheat, rice, corn) reduce
their yield by about 10%.
- Emissions worldwide 2009: 4.49t/Person
- sustainable: 2t/Capita
Just start. It's quite simple:
- Avoid unnecessary trips by car or by plane.
- In winter, reduce the temperature in your home by a few degree.
- Eat less meat.
Possible future scenarios: Global CO2 emissions (top) and global warming according to a climate scenario without political intervention (red), and with ambitious CO2-reduction, limiting the total accumulated CO2 emission to 1 trillion tons of CO2 in the first half of this century, and essentially zero emitions after that (blue). In the scenario with massive CO2-reduction, the 2050 emissions are 70% below the emissions of 1990. Without political countermeasures, global warming will surpass 2 deg by 2050. With massive CO2-reduction, this risk is reduced to 25%.
.M. Meinshausen et al. (2009) (Press announcement to this picture, in German)