Den stora tråden om global uppvärmning/växthuseffekten

Klimatprotesten, som skulle hållas vid Rådhuset i Alingsås på fredag 1 februari, har ställts in på grund av det kalla vädret. Det uppger Karin Elmgren i Alingsås Klimatfullmäktige till AT.

– Redovisa trovärdiga källor som visar att det jag fetmarkerat i din text är sant och inte lögner som du hittat på själv.

Human activities are estimated to have caused approximately 1.0°C of global warming5 above pre-industrial levels, with a likely range of 0.8°C to 1.2°C. Global warming is likely to reach 1.5°C between 2030 and 2052 if it continues to increase at the current rate.

Warming from anthropogenic emissions from the pre-industrial period to the present will persist for centuries to millennia and will continue to cause further long-term changes in the climate system, such as sea level rise, with associated impacts (high con dence), but these emissions alone are unlikely to cause global warming of 1.5°C (medium con dence).

Climate-related risks for natural and human systems are higher for global warming of 1.5°C than at present, but lower than at 2°C (high con dence). These risks depend on the magnitude and rate of warming, geographic location, levels of development and vulnerability, and on the choices and implementation of adaptation and mitigation options (high con dence).

Climate models project robust7 differences in regional climate characteristics between present-day and global warming of 1.5°C,8 and between 1.5°C and 2°C.8 These differences include increases in: mean temperature in most land and ocean regions (high con dence), hot extremes in most inhabited regions (high con dence), heavy precipitation in several regions (medium con dence), and the probability of drought and precipitation de cits in some regions (medium con dence).

By 2100, global mean sea level rise is projected to be around 0.1 metre lower with global warming of 1.5°C compared to 2°C (medium con dence). Sea level will continue to rise well beyond 2100 (high con dence), and the magnitude and rate of this rise depend on future emission pathways. A slower rate of sea level rise enables greater opportunities for adaptation in the human and ecological systems of small islands, low-lying coastal areas and deltas (medium con dence).

On land, impacts on biodiversity and ecosystems, including species loss and extinction, are projected to be lower at 1.5°C of global warming compared to 2°C. Limiting global warming to 1.5°C compared to 2°C is projected to lower the impacts on terrestrial, freshwater and coastal ecosystems and to retain more of their services to humans (high con dence).

Limiting global warming to 1.5°C compared to 2oC is projected to reduce increases in ocean temperature as well as associated increases in ocean acidity and decreases in ocean oxygen levels (high con dence). Consequently, limiting global warming to 1.5°C is projected to reduce risks to marine biodiversity, sheries, and ecosystems, and their functions and services to humans, as illustrated by recent changes to Arctic sea ice and warm-water coral reef ecosystems (high con dence).

Climate-related risks to health, livelihoods, food security, water supply, human security, and economic growth are projected to increase with global warming of 1.5°C and increase further with 2°C.

Most adaptation needs will be lower for global warming of 1.5°C compared to 2°C (high con dence). There are a wide range of adaptation options that can reduce the risks of climate change (high con dence). There are limits to adaptation and adaptive capacity for some human and natural systems at global warming of 1.5°C, with associated losses (medium con dence). The number and availability of adaptation options vary by sector (medium con dence).