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From 1930 to 1935, they developed dichlorodifluoromethane (CCl 2 F 2 or R12), trichlorofluoromethane (CCl 3 F or R11), chlorodifluoromethane (CHClF 2 or R22), trichlorotrifluoroethane (CCl 2 FCClF 2 or R113), and dichlorotetrafluoroethane (CClF 2 CClF 2 or R114), through Kinetic Chemicals which was a joint venture between DuPont and General Motors.
Worldwide production of R-22 in 2008 was about 800 Gg per year, up from about 450 Gg per year in 1998, with most production in developing countries. [2] R-22 use is being phased out in developing countries, where it is largely used for air conditioning applications.
In 1978 the United States banned the use of CFCs such as Freon in aerosol cans, the beginning of a long series of regulatory actions against their use. The critical DuPont manufacturing patent for Freon ("Process for Fluorinating Halohydrocarbons", U.S. Patent #3258500) was set to expire in 1979.
Tennessee lawmakers passed a bill banning geoengineering, but in their comments, some referenced fears that appeared to stem from the “chemtrails” conspiracy theory.
Tennessee is one of the leading states in the country for book bans. According to PEN America, there have been a total of 364 banned books in Tennessee between July 1, 2021 and December 31, 2023.
Read more:Supreme Court sounds ready to OK laws that ban hormone treatments for trans teens The Supreme Court has not ruled on whether government discrimination against transgender people is ...
On March 22, 2023, the Tennessee House of Representatives passed HB1 amending the Tennessee Code prohibiting certain forms of gender-affirming care for transgender minors with a diagnosis of gender dysphoria. [7] This includes puberty blockers, hormone therapy, and surgeries (though the ban on the latter is not at issue in the case). [8]
Law enforcement officials seeking a motive for a shooting at Nashville’s Antioch High School on Wednesday morning are examining alarming social media posts and writings tied to a teenager police ...