Which of the following is a new technique used by poachers in central africa?
poachers on the hunt for ivory have stepped up their use of poison arrows and
spears.
poachers are digging huge holes as traps for animals in the jungle.
poachers have new cameras and gps systems to track animals in the jungle.
poachers are using other wildlife as lures and bait for the animals they hunt.

Poachers have new cameras and GPS systems to track animals in the jungle. ( third choice).

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.