Being positive attracts people to you, acts as ripples to motivate them to positive action.
The news media is full of doom and gloom. Added to this the general default of many to be negative or to offer obstacles rather than solutions to challenges. People drown in negativity, there is no energy to make positive change.
As an agent of change it is better to be positive, offering solutions to problems. People are naturally drawn to the positive, and will avoid the negative. Yes, there are many challenges in the world, and humanity is risking its future, but taking away the motivation to do something about these challenges by negativity won’t improve things.
Positivity is a high energy type which inspires, motivates, getting the brain cells firing in a creative motivated way. Positivity is food to happy and healthy change. Be realistic about the challenge and its consequences, but then offer a solution within the ability of the listener to do something about it. Send out positive ripples so that others are inspired to follow your action by example.