Since 1989, I have worked as National Coordinator of the Global Change Research Program studying the changing global climate and its effects on trees, animals and forested ecosystems.
(I; have worked; as National Coordinator of the Global Change Research Program; T:Since 1989) Context(I have worked,List([12, 25))):(I; have worked as National Coordinator of the Global Change Research Program studying; the changing global climate and its effects on trees, animals and forested ecosystems)
I have worked,List([12, 25))
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have worked have worked as National Coordinator of the Global Change Research Program studying
as National Coordinator of the Global Change Research Program T:Since 1989
the changing global climate and its effects on trees, animals and forested ecosystems