Man is the most recent of the factors affecting the environment and has been so for a relatively short time. Its influence began with the development of agriculture and the consequent deforestation of the woods to convert them into arable land and pastures, up to today with large greenhouse gas emissions.
CO2 from industries and means of transport and methane in farms. intensive and in rice fields. According to the theory of global warming, or climate warming, man through his greenhouse gas emissions is responsible for much of the warming period that the Earth is going through today.
A small minority of scientists, on the other hand, believe that the weight attributed to man on the climate is overestimated, considering the current phase of climatic warming as a natural phase opposite to the natural periods of climatic cooling.
The weight of human activities on climate change is considered preponderant by the consensus of the scientific community, even if the subject of a marginal scientific debate. Climate change also affects many habitats and the fauna that populate them.
Global change in marine coastal habitats impacts insect populations and communities, study published on the Current opinion in insect science, told: "Salt marsh and mangrove coastal ecosystems provide critical ecosystem services, but are being lost at an alarming rate.
Insect communities in these ecosystems are threatened by human impacts, including sea level rise, habitat loss, external inputs including nutrients, metals, and hydrocarbons, as well as weather events, such as hurricanes.
While some disturbances are felt throughout the food web (e.g. hurricanes), others are mediated by impacts on the dominant plants. The impacts of these disturbances on insects / spiders and their rate of recovery is dependent on trophic level, life history, and diet breadth.
While we understand impacts of single disturbances relatively well, we have very little understanding of how multiple disturbances interact to affect insect communities." The predominant causes are to be found in human activity, due to the emissions into the earth's atmosphere of increasing quantities of greenhouse gases and other factors that are always attributable to human activities.
The Kyoto Protocol, signed in 1997 and which as of November 2009 counts the adhesion of 187 states, aims to reduce these man-made greenhouse gases. The Paris Agreement, signed in November 2015, commits participating States to keep the global temperature rise "well below 2 ° C" compared to pre-industrial levels.