Is technology a promise or a threat?

Is technology a promise or a threat? There are many views to this question. What does it mean when it is considered as a promise? Humans gain knowledge day by day, technology advancing too. Be it medical technology, it can saves many lives. Incurable diseases in the olden days such as malaria, tuberculosis, various cancers etc. But now, these incurable diseases can be cured. Internet and hand phones can help us communicate better.

On the other hand, technology can also be a threat. Making nuclear weapon is harmful to the environment. Involving in wars and using nuclear weapon, causing a big harm to the environment. Despite this side effect, on the whole, I think that technology is more of a promise than harm.