We speak about climate change a lot. But are we acting effectively ?
While scientists gather field data and run climate change simulations, time is running out. Our carbon budget is less than 900 GtCO2 (1 GtCO2 stands for one billion metric tons of carbon dioxyde). Past this threshold, chances are that anything that will happen will be far worse than what we can predict.
Problem is: we’ve already “spent” 600 out of those 900 GtCO2 ! At 20 GtCO2 per year, only 30 years to go…
But it won’t take that long to trash the climate, since CO2 emissions are not decreasing, but increasing fast instead.
Adverse consequences are already here: the average atmospheric CO2 level is beyond 400 ppm for the first time in human history. This trend towards higher carbon dioxyde concentrations in air wages several kinds of threats:
– the nutrient value of crops decreases, as shown in this study: http://dx.doi.org/10.1038/nature13179
– ocean level rise has sped up by over a factor two since 1990. In the long run, major worldwide damage to ecosystems from sea level rise is expected to become the major environmental crisis, worsening the currently ongoing reduction of biodiversity, freshwater resources and natural land.
The graph shows how sea levels will change for four different pathways for human development and greenhouse gas pollution. The green, yellow and orange lines correspond to scenarios where it takes 10, 30, or 70 years before emissions are stabilized. The red line can be considered to represent business as usual where greenhouse gas emissions are increasing over time.
Let’s stop fossil fuels now !
– prevents conflicts and wars
The time has come... https://www.youtube.com/watch?v=aBTZOg6l6cA&feature=kp