MonExp

[sjp123]

28 across = French town on the river Allier noted for its hot mineral springs = 5 letters

33 across = Legendary Mongol emperor visited by Marco Polo in 1275 = 2 words 6 + 4

32 down = Fossil fuel consisting of carbonised vegetable matter = 4 letters

30 down = Small parasitic insect that feeds on plant juices = 5 letters

[barender]

32 down - coal

30 down - aphid

[barender]

33 across - Gengis Khan 

[steviep165]

28a vichy

33a kublai khan not gengis