Over decades, improvements in observations of the present climate, reconstructions of ancient climate, and computer
models that simulate past,
current, and future climate have reduced some of the uncertainty in forecasting how
rising temperatures will ripple through the climate system.
Researchers used two climate
models to project
rising temperatures
over the next century and applied those results to
current safety procedures used in determining the viability of a host city.
None of these could have been caused by an increase in atmospheric CO2,
Model projections of warming during recent decades have greatly exceeded what has been observed, The
modelling community has openly acknowledged that the ability of existing
models to simulate past climates is due to numerous arbitrary tuning adjustments, Observations show no statistically valid trends in flooding or drought, and no meaningful acceleration whatsoever of pre-existing long term sea level
rise (about 6 inches per century) worldwide,
Current carbon dioxide levels, around 400 parts per million are still very small compared to the averages
over geological history, when thousands of parts per million prevailed, and when life flourished on land and in the oceans.