What are The independent, The guardian and Channel 4's political affiliations?

Hello everyone, I'm writing an essay about the politics of climate change and i came across interesting articles in The Independent and The Guardian, as well as the Doentary screened on Channel 4 : "great global warming swindle" so in order to get into the politics of this topic i need to know the political motives (that might or might not exist) behind publishing and broadcasting on these newspapers and this channel. And since i have no idea how politics work in the UK, i would really appreciate any insight on this matter. Thank you.