This reeks of grade a bullshit to be exhausted on ill-informed delusion. Think about how convinced a person (much less 2) would have to be to do that for this sole reason alone (in light of all the debate on the topic, not counting the irony in trying to kill yourself because you couldn't save yourself...). They only briefly mention at the end the article that Argentinian authorities and their parents claim it was because of the threat of global warming. Let me see the note eh? (not that I could even prove they wrote it if I read it) and then maybe we can start lambasting the dead with political rhetoric, or martyring them if thats your bag.
I think they likely did it for some other reason, and that the emphasis about killing themselves over global warming (which may have been briefly uttered in their note, or some concern they expressed in passing) has simply been overblown and used for divisive purposes, as always to divide and conquer, it has the effect of galvanizing (polarizing) both camps (those who buy man-made climate change and those who dont) even more. Its an ingenius thing to do really, well... from the media-industrial complex end anyways!!!
Think for yourself please, not for the "telegraph", who has a stake in your reliance upon them to formulate an opinion.
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