Climate Changes Is The Greatest Threat Facing Humanity Today. debate this
Answers
Answer:
reconstructing past climates, one of the key lines of evidence for human impact on climate change is that over the past few millennia we have never seen such a rate or magnitude of warming that we see now. Past climate tells us about trends and variations prior to human impact and when analysing these we never see a trajectory in temperature increases as we are seeing today.What the Intergovernmental Panel on Climate Change (IPCC) says is this: we have measured temperatures over a recent period, the past 150 years or so, on land, at sea and in particular the sea surface, which covers a large part of the planet.
Temperatures are rising and in the past few decades there has been unprecedented acceleration. We know that our production and burning of fossil fuels is rising. We can measure the chemical signature of the gases in the atmosphere, and they are not all natural. This is due to what we have burned and put into the atmosphere.
You can do a simple correlation to say that increased temperature and the presence of greenhouse gases are related. But obviously we have to deliver better science than that. One thing we can do is to look at the global climate computer models - and there are a lot of them - that represent our current understanding of how the climate works. If we run these models with what we call natural ‘forcings’ of climate - such as fluctuations in the strength of solar radiation over time - and compare them with what we have observed, then the two don’t fit. This is consistent across all the main global climate models.
There is more affecting the climate than natural forcings. This includes anthropogenic (i.e. human-induced) gases. The second thing you can do is to run the effect of these global-warming gases against what we have observed. And they don’t fit either. But, when you run the natural forcings and the anthropogenic gases together, they fit. The conclusion - and the IPCC says that this is extremely likely - is that the warming, especially in the past half-century, can’t be explained without the anthropogenic greenhouse gases.
This finding is one of the most amazing things we’ve done as scientists. We have gathered from all the major countries in the world people who are interested in understanding how climate change works and actually got them working together under the auspices of the IPCC. I can’t think of many other programmes where you have such a community of serious scientists collaborating on a global project pulling together. The majority of their data and modelling scenarios are in the public domain and it is all saying the same thing. To go against this with no evidence seems to lack an understanding of what science is for.
What’s next? As a scientist you typically collect the evidence and present it to policy makers. That is one of the tricky bridges that needs to be built. You need better dialogue with and influence over policy makers. But it seems to me that when the scientific evidence is so compelling to not do anything is very odd.
Even looking at the more moderate long-term projections of climate change you would have thought that curbing fossil fuel consumption has to be the way to go. But you could argue that economic power is the greatest power, and so unless you can cross the short-term economic argument things will get difficult.
These changes have led to the emergence of large-scale environmental hazards to human health, such as extreme weather, ozone depletion, increased danger of wildfires, loss of biodiversity, stresses to food-producing systems and the global spread of infectious diseases.
pls make as brainlist it is urgent
Explanation:
Answer:
These changes have led to the emergence of large-scale environmental hazards to human health, such as extreme weather, ozone depletion, increased danger of wildfires, loss of biodiversity, stresses to food-producing systems and the global spread of infectious diseases.
reconstructing past climates, one of the key lines of evidence for human impact on climate change is that over the past few millennia we have never seen such a rate or magnitude of warming that we see now. Past climate tells us about trends and variations prior to human impact and when analysing these we never see a trajectory in temperature increases as we are seeing today.What the Intergovernmental Panel on Climate Change (IPCC) says is this: we have measured temperatures over a recent period, the past 150 years or so, on land, at sea and in particular the sea surface, which covers a large part of the planet.
Temperatures are rising and in the past few decades there has been unprecedented acceleration. We know that our production and burning of fossil fuels is rising. We can measure the chemical signature of the gases in the atmosphere, and they are not all natural. This is due to what we have burned and put into the atmosphere.
You can do a simple correlation to say that increased temperature and the presence of greenhouse gases are related. But obviously we have to deliver better science than that. One thing we can do is to look at the global climate computer models - and there are a lot of them - that represent our current understanding of how the climate works. If we run these models with what we call natural ‘forcings’ of climate - such as fluctuations in the strength of solar radiation over time - and compare them with what we have observed, then the two don’t fit. This is consistent across all the main global climate models.
There is more affecting the climate than natural forcings. This includes anthropogenic (i.e. human-induced) gases. The second thing you can do is to run the effect of these global-warming gases against what we have observed. And they don’t fit either. But, when you run the natural forcings and the anthropogenic gases together, they fit. The conclusion - and the IPCC says that this is extremely likely - is that the warming, especially in the past half-century, can’t be explained without the anthropogenic greenhouse gases.
This finding is one of the most amazing things we’ve done as scientists. We have gathered from all the major countries in the world people who are interested in understanding how climate change works and actually got them working together under the auspices of the IPCC. I can’t think of many other programmes where you have such a community of serious scientists collaborating on a global project pulling together. The majority of their data and modelling scenarios are in the public domain and it is all saying the same thing. To go against this with no evidence seems to lack an understanding of what science is for.
What’s next? As a scientist you typically collect the evidence and present it to policy makers. That is one of the tricky bridges that needs to be built. You need better dialogue with and influence over policy makers. But it seems to me that when the scientific evidence is so compelling to not do anything is very odd.
Even looking at the more moderate long-term projections of climate change you would have thought that curbing fossil fuel consumption has to be the way to go. But you could argue that economic power is the greatest power, and so unless you can cross the short-term economic argument things will get difficult.
Explanation: