Whilst I to some extent agree with you, if the brick is then used with modern cement mortars, the result is not easily renewable, as the mortar is stronger than the brick, and it is hard to remove without destroying the bricks.

Also, small scale firing is often ineffectual as well as inefficient - If the bricks are over or under fired they have drastically reduced strength or durability. Developing world brick works rarely have the raw material , money or training to produce high quality bricks.

It is an area were sustainable development aid from the west would actually be valuable.

Indeed, modern airtight house designs do introduce their own health hazards. Low level emissions from petroleum based paints and furnishings, and radon gas from granite ground rocks are two important ones.