Let's go to the positive effects first.
The positive effect of Technology is that it makes work faster and easier. For example, in farming, you can use a tractor instead of the traditional Carabao. Or use vehicles for transportation instead of travelling bare-footed.
Now the negative effect of it is it causes pollution, it harms the environment. Harmful chemicals from a factory causes Air Pollution and Water Pollution if near the bodies of water. Vehicles cause Air Pollution.