Carl Charcoal technology seems very much the wrong way to go about "helping" Africa. One of their problems is deforestation caused by heavy reliance on wood for cooking now. Updating the small scale coal mining technologies from the early 20th century would probably help more.
Also the big problem is democracy, which in practice amounts to keeping the cities quiet. I remember reading about a decade ago that most African countries controlled the prices of food so much to keep the city people on their side, that it was uneconomical (ie, a dead loss) for farmers to sell to the market, so they only grew enough for themselves. I don't know how much this may have changed recently in some countries, but given what's going on in Zimbabwe, probably not much.
Dambisa Moyo, an African economist, has joined her voice to the other African economists [e.g. James Shikwati] calling for a full halt to Western aid. Her book is called Dead Aid and it asserts a direct cause-and-effect relationship between $1 trillion of aid and the rise in African poverty rates from 11% to 66%.
Though it's an easy enough signal to fake, I find it noteworthy that Moyo - in this interview at least - repeatedly pleads for some attention to "logic and evidence":
"I think the whole aid model is couched in pity. I don’t want to cast aspersions as to where that pity comes from. But I do think it’s based on pity because based on logic and evidence, it is very clear that aid does not work. And yet if you speak to some of the biggest supporters of aid, whether they are academics or policy makers or celebrities, their whole rationale for giving more aid to Africa is not couched in logic or evidence; it’s based largely on emotion and pity."
I was just trying to think of when was the last time I heard a Western politician - or even a mainstream Western economist in any public venue - draw an outright battle line between logic and pity. Oh, there are plenty of demagogues who claim the evidence is on their side, but they won't be so outright condemning of emotion - it's not a winning tactic. Even I avoid drawing a battle line so stark.
Moyo says she's gotten a better reception in Africa than in the West. Maybe you need to see your whole continent wrecked by emotion and pity before "logic and evidence" start to sound appealing.