South africa, botswana, canada, australia, and russia are important producers of _

They are important producers of Diamond

Here are the amount they're able to produce in a year :

- South Africa produced about 8 million carats of Diamond a year
- Botswana produced more than 23 million carats of diamond a year
- Canada produced more than 10.6 million carats of diamond a year
- Australia produced more than 12 million carats of diamond a year
and Russia Produced more than 35 million carats of diamond a year

Answer (d) the greenhouse effect is primarily caused by car and trucks;