Originally Posted by jazzguru
Key word: could.
They have no idea what will happen.
Neither do you, but what they think will happen is based upon more evidence and science than what you have offered.Climate change and insect-borne disease: Facts and figures
Mosquito larvae: Increased rainfall can create stagnant pools of water where mosquitoes breed
As the world heats up, ecosystems are visibly struggling to cope with the rapid ecological changes. Global warming has already triggered weather changes from flooding and storms to heatwaves and drought that are taking a heavy toll on people's health around the world.
In high-level meetings, developed and developing country governments are busy battling over emission targets. Meanwhile, the world's poor, who bear the biggest disease burdens, can expect soaring rates of ill health.
This increase will come partly from shifting population dynamics, as people flee flooded coasts or searing deserts for more habitable areas. A rise in diseases carried by insects, such as mosquitoes or ticks, could be a key factor. Climate influences these 'vectors' in many ways from controlling the length of their life cycle to influencing breeding conditions.
Scientists broadly agree that climate change will affect insect-borne diseases, but the exact consequences remain uncertain. Whether warmer, wetter conditions make it easier for vectors such as mosquitoes to multiply and spread disease will depend on a much broader range of ecological and societal factors than just rainfall or temperature.
Climate scientists say a rise of up to two degrees Celsius more than pre-industrial global temperatures could be manageable, with people only in specific, vulnerable regions suffering catastrophic environmental effects. Any larger temperature increase puts the whole planet's population at risk.
Initial concerns about climate change in the early 1990sfocused on environmental impacts and all but ignored links with health. But this imbalance is slowly changing as research emerges on the likely effects climate change will have on people's health and the spread of disease.
This year, for example, The Global Humanitarian Forum (GHF) published a report estimating that 315,000 people die due to climate change every year, and they predict this will rise to half a million by the year 2030.  While such estimates of direct deaths remain low relative to the size of the global population, about 310 million people are expected to have suffered ill health because of climate change by 2030.
Nine out of ten of these people will be in developing countries and the number of healthy years of life lost to environmental change, including climate change, is set to be 500 times higher in Africa than Europe
Developing countries already bear the brunt of the global disease burden. Their populations are more likely to be undernourished, lack access to clean water and contract infectious diseases such as malaria. They are also dealing with a growing epidemic of chronic diseases such as diabetes and cancer.
Climate could worsen the problems in many ways. Changing rainfall patterns and sea level rises mean some areas will become drought-prone while others are flooded. Both situations have dire consequences for access to clean water. This, in turn, means a likely spread of waterborne diseases such as cholera and diarrhoea, which alone kills nearly two million children a year.
One area of particular concern is how climate change will affect the spread of insect-borne diseases. These include dengue fever, malaria, Lyme disease, West Nile virus, Rift Valley fever, chikungunya and yellow fever. They are spread through the bite of 'vectors' such as mosquitoes, ticks and flies.
Researchers currently focus much of their attention on dengue fever and malaria, partly because the diseases are so prevalent but also because outbreaks seem linked to climate. Increased rainfall in normally dry areas, for example, can create stagnant pools of water where mosquitoes breed.
But the links between climate and insect-borne disease are far from simple (see Table 1 for potential interactions). The same rainfall increase in wet regions could reduce malaria by washing immature mosquitoes away. Changes in temperature can also have opposing effects, depending on where they occur.
Generally speaking, the malaria mosquito digests blood quicker and feeds more often in warmer weather, thus speeding up transmission. The parasite meanwhile completes its life cycle more quickly, increasing replication. In theory then, global warming might allow these vectors to spread into areas they weren't previously able to colonise.
By 2080, up to 320 million more people could be affected by malaria because of these new transmission zones.  Worryingly, the disease would then also be spreading to people whose immune systems may never have been exposed to malaria, and who may be more vulnerable as a result.
The spread of other vector-borne diseases could also increase. The cholera bacteria Vibrio cholerae can live on some species of plankton. Warmer sea temperatures mean more plankton blooms, which could mean the cholera bacteria flourishes, spreading to populations on the warm coasts of countries such as Bangladesh.
Schistosomiasis, a parasitic disease transmitted by aquatic snails, also seems to be affected by climate. In China, the latitudinal threshold beyond which temperatures were too cold for the snail to live has moved northwards, putting nearly 21 million more people at risk of the disease