regular and irregular verbs

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Across
  1. 4. What do we need to do to more trees to reduce carbon dioxide?
  2. 5. Many people have ______ (see) the effects of global warming firsthand.
  3. 7. The conference ____ (cost) millions to organise, but it helped create new climate policies.
  4. 9. The government ______ (introduce) strict laws on plastic use last year.
Down
  1. 1. They ______ (write) a petition to stop deforestation.
  2. 2. The president ______ (speak) about climate policies at the UN summit.
  3. 3. Several companies have ______ (take) steps to cut down emissions.
  4. 5. Scientists ____ (set) new climate goals to reduce emissions.
  5. 6. Scientists have ______ (find) new ways to store renewable energy.
  6. 8. Many communities have ______ (begin) using solar energy instead of coal.