Rise in temperature as seen:
- Reconstruction of the past 2000 years' global surface temperatures using proxy information from corals, ice cores, and tree rings.
- it's comparison to the pre-industrial baseline, the decade from 2011 to 2020 saw an average temperature increase of 1.09 °C [0.95–1.20 °C] (1850–1900). Surface temperatures are increasing by around 0.2 °C every ten years, and by 2020 they will be 1.2 °C higher than they were in the pre-industrial era. There have been fewer cold days and nights since 1950, whereas there have been more warm days and nights.
- During the 18th and the middle of the 19th century, there was hardly any net warming. Climate proxies, including trees and ice cores, provide information about the climate during that time. About 1850, thermometer records started to span the entire world. Historical warming and cooling trends.
CO2 emissions:
- CO2 concentrations determined from ice cores for the past 800,000 years (blue/green) and directly (black)
- Greenhouse gases make sunlight transparent so that it can heat the Earth's surface by passing through the atmosphere. It is radiated as heat by the Earth, and some of it is absorbed by greenhouse gases. By slowing the rate at which heat escapes into space, this absorption traps heat close to the Earth's surface, gradually warming it. Before the Industrial Revolution, the air near the surface was around 33 °C warmer than it would have been without naturally occurring greenhouse gases. Although the largest greenhouse gas sources to the greenhouse effect are water (50%) and clouds (25%), both grow as a function of temperature.
Environmental Issues:
Oceans, ice, and weather are all impacted by the broad and far-reaching environmental effects of climate change. Changes might come about slowly or quickly. These consequences are supported by historical research on climate change, modelling, and contemporary observations. Droughts and heat waves have increasingly occurred at the same time since the 1950s. In India and East Asia, the frequency of extremely wet or dry episodes has increased throughout the monsoon season. Hurricanes and typhoons are likely becoming more intense and frequent, and their geographic range is probably spreading poleward as a result of global warming. Climate change has not resulted in an increase in the frequency of tropical cyclones. Arctic sea ice has been reducing and thinned for decades due to climate change. With 1.5 °C of warming, ice-free summers are predicted to be uncommon, but at 2 °C of warming, they are predicted to happen once every three to ten years. Ocean chemistry has changed as a result of rising atmospheric CO2 levels. Ocean acidification is being brought on by a rise in dissolved CO2. Also, because oxygen is less soluble in warm water, the oxygen levels are dropping. Oceanic "dead zones," or areas with very little oxygen, are also growing.
Food and wellbeing:
- The greatest threat to world health in the twenty-first century, according to the WHO, is climate change. Severe weather causes harm and fatalities, and crop failures result in undernourishment. Warmer climates make it simpler to spread infectious diseases like dengue fever and malaria. The most vulnerable group to food shortages is young children. Children and the elderly are both susceptible to high heat. According to estimates from the World Health Organization (WHO), between 2030 and 2050, climate change would contribute an additional 250,000 fatalities annually. They examined elderly heat-related fatalities, increases in malaria, dengue, coastal floods, and undernutrition in children.
- 2050, there will be over 500,000 extra adult fatalities annually as a result of declining food supply and quality. Due to the combined effects of excessive heat and humidity, 50% to 75% of the world's population may experience life-threatening climate conditions by the year 2100.
- Security of food is impacted by climate change. Between 1981 and 2010, it led to a decline in the world's maize, wheat, and soybean yields. Global yields of important crops could be further reduced by future warming. Low-latitude nations will likely experience a negative impact on crop production, whilst northern nations may experience, negative effects. As a result of these effects, up to an additional 183 million people worldwide, especially those with lower incomes, are at risk of going hungry. Fish populations are also impacted by climate change.
The Livelihoods:
- Economic damages due to climate change may be severe and there is a chance of disastrous consequences. Climate change has likely already increased global economic inequality, and this trend is projected to continue. Most of the severe impacts are expected in sub-Saharan Africa, where most of the local inhabitants are dependent upon natural and agricultural resources and South-East Asia. The World Bank estimates that climate change could drive over 120 million people into poverty by 2030.
- if inequalities based on wealth and social status have worsened due to climate change. Major difficulties in mitigating, adapting, and recovering to climate shocks are faced by marginalized people who have less control over resources. Indigenous people, who on their land and ecosystems, will face endangerment to their wellness and lifestyles due to climate change. An expert elicitation concluded that the role of climate change in armed conflict has been small compared to factors such as socio-economic inequality and state capabilities.
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