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An impact event is a collision between astronomical objects causing measurable effects. [1] Impact events have been found to regularly occur in planetary systems, though the most frequent involve asteroids, comets or meteoroids and have minimal effect.
The climate crisis encompasses global warming and climate change, which have resulted from the excessive accumulation of greenhouse gases in the Earth's atmosphere. [8] It leads to rising temperatures, sea-level rise, and extreme weather events such as extreme precipitation, flooding, extreme heat events, severe storms, drought and more. [8]
Planetary boundaries are a framework to describe limits to the impacts of human activities on the Earth system. Beyond these limits, the environment may not be able to self-regulate anymore. Beyond these limits, the environment may not be able to self-regulate anymore.
The effects of climate change are impacting humans everywhere in the world. [233] Impacts can be observed on all continents and ocean regions, [234] with low-latitude, less developed areas facing the greatest risk. [235] Continued warming has potentially "severe, pervasive and irreversible impacts" for people and ecosystems. [236]
A study from 2022 concluded: "Clearly the existence of a future tipping threshold for the WAM (West African Monsoon) and Sahel remains uncertain as does its sign but given multiple past abrupt shifts, known weaknesses in current models, and huge regional impacts but modest global climate feedback, we retain the Sahel/WAM as a potential regional ...
The planetary heat content that resides in the climate system can be compiled given the heat capacity, density and temperature distributions of each of its components. Most regions are now reasonably well sampled and monitored, with the most significant exception being the deep ocean.
Some climate change effects: wildfire caused by heat and dryness, bleached coral caused by ocean acidification and heating, environmental migration caused by desertification, and coastal flooding caused by storms and sea level rise. Effects of climate change are well documented and growing for Earth's natural environment and human societies. Changes to the climate system include an overall ...
Humans are altering the planet's biogeochemical cycles in a largely unregulated way with limited knowledge of the consequences. [10] Without steps to effectively manage the Earth system – the planet's physical, chemical, biological and social components – it is likely there will be severe impacts on people and ecosystems.