Scientists believe that earth is becoming warmer. this idea will become unacceptable over time if
it is not discussed in a scientific forum
scientific evidence supports a new idea
scientists propose alternative hypothesis
new instruments are invented to measure temperature

Scientific evidence supports a new idea.

Explanation:

Any hypothesis or scientific statement can only be considered valid if it is supported by a evidences and data obtain or produced after the implementation of experimental procedures. The scientific statement or hypothesis can be considered incorrect or false if more valid evidences obtain in future which may be more acceptable.

Therefore, the idea, Scientists believe that Earth is becoming warmer can become unacceptable over time if new ideas which contradict the given idea comes with valid and supportive ideas.

Scientists believe that Earth is becoming warmer. This idea will become unacceptable over time if scientific evidence supports a new idea .

Explanation:

Scientists assert events and situations based on scientific evidence, which is the set of elements that prove that a scientific hypothesis is correct or incorrect. There is now scientific evidence to prove that the earth is getting warmer and that it will get hotter in the coming years. Because of this evidence, scientists confirm that we are experiencing global warming.

However, this idea will be discredited if new scientific evidence emerges proving that this idea is wrong, or supporting a new idea. In this way scientists will stop affirming the occurrence of global warming and defend other ideas.