Climate change and public health - past, present, future

The evolution of the planet's climate is multifactorial influenced and has a dynamic over time. Many scientists have approached this controversial field, and each relies on objective but divergent statistics. Geographers have established that planet Earth is in a period of slight slow cooling, not at the level of the four prehistoric ice ages, but only at the level of the Little Ice Age from the Middle Ages which probably caused the great migration of peoples from Asia to Europe. This slow cooling is only slowed down and may even be partially reversed by anthropogenic activities. The industry produces large amounts of carbon dioxide from burning fossil fuels and other greenhouse gases. Animals produce carbon dioxide through respiration and digestion, some also methane. The waste degradation, fires, volcanic eruptions, swamps, and thawing of permafrost release carbon dioxide, methane, and other greenhouse gases into the atmosphere. Climate change exit and has always existed, but there is no scientific evidence for global warming or for climate risks other than those we already know. Public health is already facing danger, directly and indirectly, for multiple reasons, to which,climate change" is added.