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From the emission lines of molecular hydrogen, we can recover unique
information concerning the interaction of protostars with their environments.
Recent observations of perfect fluoresence from the Rosette Cat's Eye is
contrasted with extreme high-velocity H2 in several outflows in the DR21 region
and with a perfect bow shock in L1448. Moving on from ISO and Spitzer, the next jump in
performance is expected from JWST and then SPICA. Implications for source evolution, outbursts, as well as
envelope and cloud structure will be discussed.
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