Bonsoir pourriez-vous m’aider svp, merci

Réponse:

1. Wrong , it was the American weather station that recorded high levels of CO2 in the atmosphere , more exactly : 400ppm
2. Right
3. Wrong, the last time that Earth saw this level was five million years ago
4. Wrong it can stay in the atmosphere hundreds of years.
5. Wrong , scientists know that this was caused by human activity .