Anchor: Their cumulative and longer term effects, however, some of which may be largely unknown at this time, may be substantial.
Entailed: While we don't know what the longer term effects may be, they're likely to be substantial.
Contradiction: Their cumulative and long term effects are predictable and likely insubstantial.
Contradiction: A shark is surfing.
Contradiction: Adopting the metric system would be a disadvantage to the Americans.
Contradiction: Dowd doesn't need any help for ideas.
Contradiction: There were hunters who lived to hold the tribes hostage.