Timothy John Nielsen (born 1968), English-born Australian first-class cricketer
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John Nielsen-Gammon (born 1962), American meteorologist, climatologist and academic
On December 22, 2009, Nielsen-Gammon wrote a detailed analysis of the erroneous projected date of melting of Himalayan glaciers in the Working Group II section of the IPCC Fourth Assessment Report which said that "the likelihood of them disappearing by the year 2035 and perhaps sooner is very high if the Earth keeps warming at the current rate."
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The story had been covered by BBC News but had not at that time gained wider publicity.
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One of the multiple McLaren F1 GTR teams in the series, they won the team and drivers championship in their first year of competition with drivers John Nielsen and Thomas Bscher The team also finished third at the 24 Hours of Le Mans that year, running the Harrod's-sponsored McLaren with drivers Andy Wallace and Derek and Justin Bell.