  In this work, we propose an approach to teaching global warming adapted to
the new high school curricula. The aim is to build a link between CO$_2$
emissions and the rise in the Earth's average temperature, based as far as
possible on explicit empirical evidence. We first present the existing teaching
approaches on the subject, which are then related to the a prioir students'
ideas, in particular: the non-evidence of interactions between gases and
radiation. The didactic choices structuring the approach are then exposed. They
are based on the interpretation of experiments carried out with an infrared
camera in a spectral range allowing the emission and absorption of CO$_2$ to be
seen.
