It was very uncertain that the relatively small human populations and cultivated areas could have made a significant difference, more research was needed to quantify relevant factors.
More research was needed to quantify relevant factors. It was very uncertain that the relatively small human populations and cultivated areas could have made a significant difference.
It was very uncertain that the relatively small human populations and cultivated areas could have made a significant difference. More research was needed to quantify relevant factors.
It was very uncertain that the relatively small human populations and cultivated areas could have made a significant difference. More research was needed to quantify relevant factors.