Update - The most basic error in their literature is to show children a glass jar and claim that this acts like CO2 gas by "trapping heat" as in the so-called "greenhouse effect". This is completely wrong as the mechanism by which the jar traps heat is by preventing convection from dispersing the warm air. This is deliberately not taught, and so it is a false idea implanted in the children's mind. Only the brightest child is likely to spot this - though if he did then the teacher would have to admit the analogy is false, undermining the point of the experiment in the context of atmospheric warming. As far as science teaching is concerned, this subject is far too difficult for children aged 7 to 11 to understand and were it not for the political aspect Oxfam would not be interested in pushing it into schools at all. We might as well try to teach them nuclear fission.
Look at Activity 1.3 and in particular the diagram with all the "ideas" posted on it. Not one item is "off message" suggesting complete agreement among all the students who are obviously simply parroting back what they have been told. I wonder what would happen if a child put something "off message" on to the chart? It's time for the child to tell the emperor that he has no clothes.