Tone is related, first of all, to word choice. It is preferable to use words that sound scientific, if only to suggest that your thoughts are not associated with the here and now. Instead of “money,” for instance, discuss “currency.” Also, you must avoid terms that are charged with emotion as a result of their history: don’t say “political revolts,” but talk about “resilience”; don’t discuss “class,” but analyze social “categories.” Some even turn their noses up at the expression “tax justice,” which is deemed “too political.”