▁needed . ▁The ▁report ▁also ▁indicates ▁that ▁in ▁Camb odia ▁ 3 6 9 , 0 0 0 ▁tons ▁of ▁non - ren ew able ▁bi om ass ▁wood ▁fuel ▁is ▁consum ed ▁year ly ▁for ▁char co al ▁production ▁for ▁these ▁st ov es , ▁destroy ing ▁ 4 5   km ² ▁of ▁decid uous ▁for ests . ▁ 4 % ▁of ▁the ▁forest ▁reg rows . ▁ ▁Some ▁designs ▁also ▁make ▁the ▁st ove ▁sa fer , ▁prevent ing ▁burn s ▁that ▁often ▁occur ▁when ▁children ▁st umble ▁into ▁open ▁fires . ▁Some ▁of ▁the ▁new ▁st ove ▁designs ▁are ▁as ▁follows : ▁ ▁Br ick ▁and ▁mort ar ▁st ove ▁ ▁A ▁variety ▁of ▁new ▁brick ▁and ▁mort ar ▁st ov es ▁have ▁emer ged . ▁Most ▁of ▁the ▁new ▁designs ▁incorpor ate ▁a ▁comb ust ion ▁chamber ▁found ▁in ▁a ▁Ro cket ▁st ove . ▁By ▁conf ining ▁comb ust ion ▁to ▁an ▁ins ulated ▁and ▁en closed ▁area , ▁the ▁st ov es ▁increase ▁the ▁core ▁temperature ▁and ▁thereby ▁achieve ▁more ▁complete ▁comb ust ion . ▁This ▁allows ▁a ▁smaller ▁amount ▁of ▁fuel ▁to ▁burn ▁hot ter , ▁while ▁producing ▁less ▁ash ▁and ▁smoke . ▁The ▁Just a ▁Sto ve ▁is ▁a ▁simple ▁bi om ass ▁st ove ▁built ▁around ▁an ▁ins ulated , ▁el bow - sh aped ▁comb ust ion ▁chamber ▁which ▁provides ▁more ▁inten se ▁heat ▁and ▁cleaner ▁comb ust ion ▁than ▁an ▁open ▁fire , ▁meaning ▁that ▁it ▁cons umes ▁less ▁fuel ▁than