As with COVID-19, the global health impacts of climate change are difficult to imagine but scientifically predictable. In the COVID-19 crisis, we were forced to change behaviours that had rarely been questioned in our daily routine. If we do not just dismiss 2020 and go back to life as we knew it, but rather let these experiences guide us, a triple win beckons: improving public health, creating a sustainable economy and protecting the environment.
Let's be honest, who could have predicted at the beginning of 2020 how the year would turn out. Of course, the epidemiological textbooks were outspoken about pandemics being one of the greatest global health risks of all time. Theoretically, we would have known and could have read in these books how a global pandemic could unfold. But probably very few of us could have concretely imagined how much it would affect our everyday lives. An example: at the end of 2019, we were working on a strategy to reduce greenhouse gases at Swiss TPH.
It was obvious that for a globally active research institution, travel is the biggest contributor to our greenhouse gas emissions. So we thought about how large travel reductions could be made without compromising the quality of our work. Should we set a target of 10% or 20% reduction per year? Eventually, hardly any travel was undertaken at Swiss TPH. Globally, greenhouse gas emissions have fallen by around 8% in 2020, according to the Lancet Countdown Report. In 2020, hardly any travel was undertaken at Swiss TPH. This means that in 2020 the world achieved what was needed for the 1.5 degree target; but unfortunately not with climate policy, but instead COVID-19 lockdowns.
This is of course unsustainable and economically damaging. This makes it all the more important that we learn from the COVID-19 crisis when we think about tackling the climate crisis. The global impacts of climate change, as with COVID-19, are intuitively difficult to imagine but scientifically easy to predict. Only with early and decisive action can the impacts be minimised.
Climate change affects everyone
Since 2015, six of the warmest years globally have all occurred. The environmental changes associated with this warming have direct and indirect impacts on health. Since 2000, heat-related mortality has increased by more than 50% among people over the age of 65, which now equates to a total of 300,000 heat-related deaths per year. Even in moderate climate regions such as Switzerland, around 1,500 heat-related deaths have been observed since 2015.
Globally, areas where vector-borne diseases are likely to occur are increasing. Since 1950, climate suitability for the transmission of malaria in highland areas has increased by 40% in Africa and by 150% in the Western Pacific region. Changes are also seen in Europe. Since the first Chikungunya outbreak in Ravenna in 2007, localised autochthonous outbreaks of dengue, Zika or Chikungunya have been observed in Italy and Southern France almost every year since 2013. Autochthonous transmission of leishmaniosis by sand-flies has already been observed in Germany or Mediterranean spotted fever by dog ticks in Switzerland. The list of climate-related health risks is long, and includes forest fires and the associated air pollutants, increasing ozone pollution, droughts, floods, food security, migration and much more.